diff --git a/src/specklepy/core/api/models/__init__.py b/src/specklepy/core/api/models/__init__.py
index 92c72477..32103678 100644
--- a/src/specklepy/core/api/models/__init__.py
+++ b/src/specklepy/core/api/models/__init__.py
@@ -29,6 +29,8 @@
     Stream,
     Streams,
 )
+from specklepy.core.api.models.instances import InstanceDefinitionProxy, InstanceProxy
+from specklepy.core.api.models.proxies import ColorProxy, GroupProxy
 from specklepy.core.api.models.subscription_messages import (
     ProjectModelsUpdatedMessage,
     ProjectUpdatedMessage,
@@ -68,4 +70,8 @@
     "Streams",
     "Activity",
     "ActivityCollection",
+    "InstanceProxy",
+    "InstanceDefinitionProxy",
+    "ColorProxy",
+    "GroupProxy",
 ]
diff --git a/src/specklepy/core/api/models/instances.py b/src/specklepy/core/api/models/instances.py
new file mode 100644
index 00000000..fd72030f
--- /dev/null
+++ b/src/specklepy/core/api/models/instances.py
@@ -0,0 +1,28 @@
+from specklepy.objects.base import Base
+
+
+class InstanceProxy(
+    Base,
+    speckle_type="Speckle.Core.Models.Instances.InstanceProxy",
+):
+    """
+    A proxy class for an instance (e.g, a rhino block, or an autocad block reference).
+    """
+
+    definitionId: str
+    transform: list[float]
+    units: str
+    maxDepth: int
+
+
+class InstanceDefinitionProxy(
+    Base,
+    speckle_type="Speckle.Core.Models.Instances.InstanceDefinitionProxy",
+):
+    """
+    A proxy class for an instance definition.
+    """
+
+    objects: list[str]
+    maxDepth: int
+    name: str
diff --git a/src/specklepy/core/api/models/proxies.py b/src/specklepy/core/api/models/proxies.py
new file mode 100644
index 00000000..d0ac2964
--- /dev/null
+++ b/src/specklepy/core/api/models/proxies.py
@@ -0,0 +1,27 @@
+from specklepy.objects.base import Base
+
+
+class ColorProxy(
+    Base,
+    speckle_type="Speckle.Core.Models.Proxies.ColorProxy",
+):
+    """
+    Represents a color that is found on objects and collections in a root collection.
+    """
+
+    objects: list[str]
+    value: int
+    name: str | None  # nullable but required
+
+
+class GroupProxy(
+    Base,
+    speckle_type="Speckle.Core.Models.Proxies.GroupProxy",
+):
+    """
+    Grouped objects with a meaningful way for host application so use this proxy if you want to group object references for any purpose.
+    i.e. in rhino -> creating group make objects selectable/moveable/editable together.
+    """
+
+    objects: list[str]
+    name: str
diff --git a/src/specklepy/objects/GIS/CRS.py b/src/specklepy/objects/GIS/CRS.py
deleted file mode 100644
index 2527fe55..00000000
--- a/src/specklepy/objects/GIS/CRS.py
+++ /dev/null
@@ -1,15 +0,0 @@
-from typing import Optional
-
-from specklepy.objects.base import Base
-
-
-class CRS(Base, speckle_type="Objects.GIS.CRS"):
-    """A Coordinate Reference System stored in wkt format"""
-
-    name: Optional[str] = None
-    authority_id: Optional[str] = None
-    wkt: Optional[str] = None
-    units_native: Optional[str] = None
-    offset_x: Optional[float] = None
-    offset_y: Optional[float] = None
-    rotation: Optional[float] = None
diff --git a/src/specklepy/objects/GIS/__init__.py b/src/specklepy/objects/GIS/__init__.py
deleted file mode 100644
index 5ac3dff8..00000000
--- a/src/specklepy/objects/GIS/__init__.py
+++ /dev/null
@@ -1,24 +0,0 @@
-"""Builtin Speckle object kit."""
-
-from specklepy.objects.GIS.CRS import CRS
-from specklepy.objects.GIS.geometry import (
-    GisLineElement,
-    GisPointElement,
-    GisPolygonElement,
-    GisPolygonGeometry,
-    GisRasterElement,
-    PolygonGeometry,
-)
-from specklepy.objects.GIS.layers import RasterLayer, VectorLayer
-
-__all__ = [
-    "VectorLayer",
-    "RasterLayer",
-    "GisPolygonGeometry",
-    "PolygonGeometry",
-    "GisPolygonElement",
-    "GisLineElement",
-    "GisPointElement",
-    "GisRasterElement",
-    "CRS",
-]
diff --git a/src/specklepy/objects/GIS/geometry.py b/src/specklepy/objects/GIS/geometry.py
deleted file mode 100644
index 68df54cf..00000000
--- a/src/specklepy/objects/GIS/geometry.py
+++ /dev/null
@@ -1,74 +0,0 @@
-from typing import List, Optional, Union
-
-from specklepy.objects.base import Base
-from specklepy.objects.geometry import (
-    Arc,
-    Circle,
-    Line,
-    Mesh,
-    Point,
-    Polycurve,
-    Polyline,
-)
-
-
-class PolygonGeometry(Base, speckle_type="Objects.GIS.PolygonGeometry"):
-    """GIS Polygon Geometry"""
-
-    boundary: Optional[Polyline]
-    voids: Optional[List[Polyline]]
-
-
-GisPolygonGeometry = PolygonGeometry
-
-
-class GisPolygonElement(Base, speckle_type="Objects.GIS.PolygonElement"):
-    """GIS Polygon element"""
-
-    geometry: Optional[List[GisPolygonGeometry]] = None
-    attributes: Optional[Base] = None
-
-
-class GisLineElement(Base, speckle_type="Objects.GIS.LineElement"):
-    """GIS Polyline element"""
-
-    geometry: Optional[List[Union[Polyline, Arc, Line, Circle, Polycurve]]] = None
-    attributes: Optional[Base] = None
-
-
-class GisPointElement(Base, speckle_type="Objects.GIS.PointElement"):
-    """GIS Point element"""
-
-    geometry: Optional[List[Point]] = None
-    attributes: Optional[Base] = None
-
-
-class GisRasterElement(
-    Base, speckle_type="Objects.GIS.RasterElement", detachable={"displayValue"}
-):
-    """GIS Raster element"""
-
-    band_count: Optional[int] = None
-    band_names: Optional[List[str]] = None
-    x_origin: Optional[float] = None
-    y_origin: Optional[float] = None
-    x_size: Optional[int] = None
-    y_size: Optional[int] = None
-    x_resolution: Optional[float] = None
-    y_resolution: Optional[float] = None
-    noDataValue: Optional[List[float]] = None
-    displayValue: Optional[List[Mesh]] = None
-
-
-class GisTopography(
-    GisRasterElement,
-    speckle_type="Objects.GIS.GisTopography",
-    detachable={"displayValue"},
-):
-    """GIS Raster element with 3d Topography representation"""
-
-
-class GisNonGeometryElement(Base, speckle_type="Objects.GIS.NonGeometryElement"):
-    """GIS Table feature"""
-
-    attributes: Optional[Base] = None
diff --git a/src/specklepy/objects/GIS/layers.py b/src/specklepy/objects/GIS/layers.py
deleted file mode 100644
index 3db33351..00000000
--- a/src/specklepy/objects/GIS/layers.py
+++ /dev/null
@@ -1,142 +0,0 @@
-from typing import Any, Dict, List, Optional, Union
-
-from deprecated import deprecated
-
-from specklepy.objects.base import Base
-from specklepy.objects.GIS.CRS import CRS
-from specklepy.objects.other import Collection
-
-
-@deprecated(version="2.15", reason="Use VectorLayer or RasterLayer instead")
-class Layer(Base, detachable={"features"}):
-    """A GIS Layer"""
-
-    def __init__(
-        self,
-        name: Optional[str] = None,
-        crs: Optional[CRS] = None,
-        units: str = "m",
-        features: Optional[List[Base]] = None,
-        layerType: str = "None",
-        geomType: str = "None",
-        renderer: Optional[Dict[str, Any]] = None,
-        **kwargs,
-    ) -> None:
-        super().__init__(**kwargs)
-        self.name = name
-        self.crs = crs
-        self.units = units
-        self.type = layerType
-        self.features = features or []
-        self.geomType = geomType
-        self.renderer = renderer or {}
-
-
-@deprecated(version="2.16", reason="Use VectorLayer or RasterLayer instead")
-class VectorLayer(
-    Collection,
-    detachable={"elements"},
-    speckle_type="VectorLayer",
-    serialize_ignore={"features"},
-):
-    """GIS Vector Layer"""
-
-    name: Optional[str] = None
-    crs: Optional[Union[CRS, Base]] = None
-    units: Optional[str] = None
-    elements: Optional[List[Base]] = None
-    attributes: Optional[Base] = None
-    geomType: Optional[str] = "None"
-    renderer: Optional[Dict[str, Any]] = None
-    collectionType = "VectorLayer"
-
-    @property
-    @deprecated(version="2.14", reason="Use elements")
-    def features(self) -> Optional[List[Base]]:
-        return self.elements
-
-    @features.setter
-    def features(self, value: Optional[List[Base]]) -> None:
-        self.elements = value
-
-
-@deprecated(version="2.16", reason="Use VectorLayer or RasterLayer instead")
-class RasterLayer(
-    Collection,
-    detachable={"elements"},
-    speckle_type="RasterLayer",
-    serialize_ignore={"features"},
-):
-    """GIS Raster Layer"""
-
-    name: Optional[str] = None
-    crs: Optional[Union[CRS, Base]] = None
-    units: Optional[str] = None
-    rasterCrs: Optional[Union[CRS, Base]] = None
-    elements: Optional[List[Base]] = None
-    geomType: Optional[str] = "None"
-    renderer: Optional[Dict[str, Any]] = None
-    collectionType = "RasterLayer"
-
-    @property
-    @deprecated(version="2.14", reason="Use elements")
-    def features(self) -> Optional[List[Base]]:
-        return self.elements
-
-    @features.setter
-    def features(self, value: Optional[List[Base]]) -> None:
-        self.elements = value
-
-
-class VectorLayer(  # noqa: F811
-    Collection,
-    detachable={"elements"},
-    speckle_type="Objects.GIS.VectorLayer",
-    serialize_ignore={"features"},
-):
-    """GIS Vector Layer"""
-
-    name: Optional[str] = None
-    crs: Optional[Union[CRS, Base]] = None
-    units: Optional[str] = None
-    elements: Optional[List[Base]] = None
-    attributes: Optional[Base] = None
-    geomType: Optional[str] = "None"
-    renderer: Optional[Dict[str, Any]] = None
-    collectionType = "VectorLayer"
-
-    @property
-    @deprecated(version="2.14", reason="Use elements")
-    def features(self) -> Optional[List[Base]]:
-        return self.elements
-
-    @features.setter
-    def features(self, value: Optional[List[Base]]) -> None:
-        self.elements = value
-
-
-class RasterLayer(  # noqa: F811
-    Collection,
-    detachable={"elements"},
-    speckle_type="Objects.GIS.RasterLayer",
-    serialize_ignore={"features"},
-):
-    """GIS Raster Layer"""
-
-    name: Optional[str] = None
-    crs: Optional[Union[CRS, Base]] = None
-    units: Optional[str] = None
-    rasterCrs: Optional[Union[CRS, Base]] = None
-    elements: Optional[List[Base]] = None
-    geomType: Optional[str] = "None"
-    renderer: Optional[Dict[str, Any]] = None
-    collectionType = "RasterLayer"
-
-    @property
-    @deprecated(version="2.14", reason="Use elements")
-    def features(self) -> Optional[List[Base]]:
-        return self.elements
-
-    @features.setter
-    def features(self, value: Optional[List[Base]]) -> None:
-        self.elements = value
diff --git a/src/specklepy/objects/__init__.py b/src/specklepy/objects/__init__.py
index 85faa492..3305ac2c 100644
--- a/src/specklepy/objects/__init__.py
+++ b/src/specklepy/objects/__init__.py
@@ -1,14 +1,6 @@
 """Builtin Speckle object kit."""
 
-from specklepy.objects import (
-    GIS,
-    encoding,
-    geometry,
-    other,
-    primitive,
-    structural,
-    units,
-)
+from specklepy.objects import encoding, geometry, other, primitive, units
 from specklepy.objects.base import Base
 
 __all__ = [
@@ -17,7 +9,5 @@
     "geometry",
     "other",
     "units",
-    "structural",
     "primitive",
-    "GIS",
 ]
diff --git a/src/specklepy/objects/other.py b/src/specklepy/objects/other.py
index 5a2576e4..27712a91 100644
--- a/src/specklepy/objects/other.py
+++ b/src/specklepy/objects/other.py
@@ -1,13 +1,12 @@
-from typing import Any, List, Optional
+from typing import List, Optional
 
 from deprecated import deprecated
 
-from specklepy.objects.geometry import Plane, Point, Polyline, Vector
+from specklepy.objects.geometry import Point, Vector
 
 from .base import Base
 
 OTHER = "Objects.Other."
-OTHER_REVIT = OTHER + "Revit."
 
 IDENTITY_TRANSFORM = [
     1.0,
@@ -29,21 +28,6 @@
 ]
 
 
-class Material(Base, speckle_type=OTHER + "Material"):
-    """Generic class for materials containing generic parameters."""
-
-    name: Optional[str] = None
-
-
-class RevitMaterial(Material, speckle_type="Objects.Other.Revit." + "RevitMaterial"):
-    materialCategory: Optional[str] = None
-    materialClass: Optional[str] = None
-    shininess: Optional[int] = None
-    smoothness: Optional[int] = None
-    transparency: Optional[int] = None
-    parameters: Optional[Base] = None
-
-
 class RenderMaterial(Base, speckle_type=OTHER + "RenderMaterial"):
     name: Optional[str] = None
     opacity: float = 1
@@ -53,36 +37,16 @@ class RenderMaterial(Base, speckle_type=OTHER + "RenderMaterial"):
     emissive: int = -16777216  # black arbg
 
 
-class MaterialQuantity(Base, speckle_type=OTHER + "MaterialQuantity"):
-    material: Optional[Material] = None
-    volume: Optional[float] = None
-    area: Optional[float] = None
-
-
-class DisplayStyle(Base, speckle_type=OTHER + "DisplayStyle"):
-    """
-    Minimal display style class.
-    Developed primarily for display styles in Rhino and AutoCAD.
-    Rhino object attributes uses OpenNURBS definition for linetypes and lineweights.
-    """
-
-    name: Optional[str] = None
-    color: int = -2894893  # light gray arbg
-    linetype: Optional[str] = None
-    lineweight: float = 0
-
-
-class Text(Base, speckle_type=OTHER + "Text"):
+class RenderMaterialProxy(
+    Base,
+    speckle_type="Speckle.Core.Models.Proxies.RenderMaterialProxy",
+):
     """
-    Text object to render it on viewer.
+    Used to store render material to object relationships in root collections.
     """
 
-    plane: Plane
-    value: str
-    height: float
-    rotation: float
-    displayValue: Optional[List[Polyline]] = None
-    richText: Optional[str] = None
+    objects: list[str]
+    value: RenderMaterial
 
 
 class Transform(
@@ -253,59 +217,10 @@ def from_list(cls, value: Optional[List[float]] = None) -> "Transform":
         return cls(value=value)
 
 
-class BlockDefinition(
-    Base, speckle_type=OTHER + "BlockDefinition", detachable={"geometry"}
-):
-    name: Optional[str] = None
-    basePoint: Optional[Point] = None
-    geometry: Optional[List[Base]] = None
-
-
-class Instance(Base, speckle_type=OTHER + "Instance", detachable={"definition"}):
-    transform: Optional[Transform] = None
-    definition: Optional[Base] = None
-
-
-class BlockInstance(
-    Instance, speckle_type=OTHER + "BlockInstance", serialize_ignore={"blockDefinition"}
-):
-    @property
-    @deprecated(version="2.13", reason="Use definition")
-    def blockDefinition(self) -> Optional[BlockDefinition]:
-        if isinstance(self.definition, BlockDefinition):
-            return self.definition
-        return None
-
-    @blockDefinition.setter
-    def blockDefinition(self, value: Optional[BlockDefinition]) -> None:
-        self.definition = value
-
-
-class RevitInstance(Instance, speckle_type=OTHER_REVIT + "RevitInstance"):
-    level: Optional[Base] = None
-    facingFlipped: bool
-    handFlipped: bool
-    parameters: Optional[Base] = None
-    elementId: Optional[str]
-
-
-# TODO: prob move this into a built elements module, but just trialling this for now
-class RevitParameter(Base, speckle_type="Objects.BuiltElements.Revit.Parameter"):
-    name: Optional[str] = None
-    value: Any = None
-    applicationUnitType: Optional[str] = None  # eg UnitType UT_Length
-    applicationUnit: Optional[str] = None  # DisplayUnitType eg DUT_MILLIMITERS
-    applicationInternalName: Optional[
-        str
-    ] = None  # BuiltInParameterName or GUID for shared parameter
-    isShared: bool = False
-    isReadOnly: bool = False
-    isTypeParameter: bool = False
-
-
 class Collection(
-    Base, speckle_type="Speckle.Core.Models.Collection", detachable={"elements"}
+    Base,
+    speckle_type="Speckle.Core.Models.Collections.Collection",
+    detachable={"elements"},
 ):
     name: Optional[str] = None
-    collectionType: Optional[str] = None
     elements: Optional[List[Base]] = None
diff --git a/src/specklepy/objects/structural/__init__.py b/src/specklepy/objects/structural/__init__.py
deleted file mode 100644
index dc91f3a2..00000000
--- a/src/specklepy/objects/structural/__init__.py
+++ /dev/null
@@ -1,142 +0,0 @@
-"""Builtin Speckle object kit."""
-
-from specklepy.objects.structural.analysis import (
-    Model,
-    ModelInfo,
-    ModelSettings,
-    ModelUnits,
-)
-from specklepy.objects.structural.axis import Axis, AxisType
-from specklepy.objects.structural.geometry import (
-    Element1D,
-    Element2D,
-    Element3D,
-    ElementType1D,
-    ElementType2D,
-    ElementType3D,
-    Node,
-    Restraint,
-)
-from specklepy.objects.structural.loading import (
-    ActionType,
-    BeamLoadType,
-    CombinationType,
-    FaceLoadType,
-    Load,
-    LoadAxisType,
-    LoadBeam,
-    LoadCase,
-    LoadCombinations,
-    LoadDirection,
-    LoadDirection2D,
-    LoadFace,
-    LoadGravity,
-    LoadNode,
-    LoadType,
-)
-from specklepy.objects.structural.materials import (
-    Concrete,
-    MaterialType,
-    Steel,
-    StructuralMaterial,
-    Timber,
-)
-from specklepy.objects.structural.properties import (
-    BaseReferencePoint,
-    MemberType,
-    Property,
-    Property1D,
-    Property2D,
-    Property3D,
-    PropertyDamper,
-    PropertyMass,
-    PropertySpring,
-    PropertyType2D,
-    PropertyType3D,
-    PropertyTypeDamper,
-    PropertyTypeSpring,
-    ReferenceSurface,
-    ReferenceSurfaceEnum,
-    SectionProfile,
-    ShapeType,
-    shapeType,
-)
-from specklepy.objects.structural.results import (
-    Result,
-    Result1D,
-    Result2D,
-    Result3D,
-    ResultGlobal,
-    ResultNode,
-    ResultSet1D,
-    ResultSet2D,
-    ResultSet3D,
-    ResultSetAll,
-    ResultSetNode,
-)
-
-__all__ = [
-    "Element1D",
-    "Element2D",
-    "Element3D",
-    "ElementType1D",
-    "ElementType2D",
-    "ElementType3D",
-    "AxisType",
-    "Axis",
-    "Node",
-    "Restraint",
-    "Load",
-    "LoadType",
-    "ActionType",
-    "BeamLoadType",
-    "FaceLoadType",
-    "LoadDirection",
-    "LoadDirection2D",
-    "LoadAxisType",
-    "CombinationType",
-    "LoadBeam",
-    "LoadCase",
-    "LoadCombinations",
-    "LoadFace",
-    "LoadGravity",
-    "LoadNode",
-    "Model",
-    "ModelInfo",
-    "ModelSettings",
-    "ModelUnits",
-    "MaterialType",
-    "Concrete",
-    "StructuralMaterial",
-    "Steel",
-    "Timber",
-    "Property",
-    "Property1D",
-    "Property2D",
-    "Property3D",
-    "PropertyDamper",
-    "PropertyMass",
-    "PropertySpring",
-    "SectionProfile",
-    "MemberType",
-    "BaseReferencePoint",
-    "ReferenceSurface",
-    "PropertyType2D",
-    "PropertyType3D",
-    "ShapeType",
-    "PropertyTypeSpring",
-    "PropertyTypeDamper",
-    "ReferenceSurfaceEnum",
-    "shapeType",
-    "Result",
-    "Result1D",
-    "ResultSet1D",
-    "Result2D",
-    "ResultSet2D",
-    "Result3D",
-    "ResultSet3D",
-    "ResultGlobal",
-    "ResultSetNode",
-    "ResultNode",
-    "ResultSetAll",
-]
diff --git a/src/specklepy/objects/structural/analysis.py b/src/specklepy/objects/structural/analysis.py
deleted file mode 100644
index ee82eead..00000000
--- a/src/specklepy/objects/structural/analysis.py
+++ /dev/null
@@ -1,49 +0,0 @@
-from typing import List, Optional
-
-from specklepy.objects.base import Base
-
-STRUCTURAL_ANALYSIS = "Objects.Structural.Analysis."
-
-
-class ModelUnits(Base, speckle_type=STRUCTURAL_ANALYSIS + "ModelUnits"):
-    length: Optional[str] = None
-    sections: Optional[str] = None
-    displacements: Optional[str] = None
-    stress: Optional[str] = None
-    force: Optional[str] = None
-    mass: Optional[str] = None
-    time: Optional[str] = None
-    temperature: Optional[str] = None
-    velocity: Optional[str] = None
-    acceleration: Optional[str] = None
-    energy: Optional[str] = None
-    angle: Optional[str] = None
-    strain: Optional[str] = None
-
-
-class ModelSettings(Base, speckle_type=STRUCTURAL_ANALYSIS + "ModelSettings"):
-    modelUnits: Optional[ModelUnits] = None
-    steelCode: Optional[str] = None
-    concreteCode: Optional[str] = None
-    coincidenceTolerance: float = 0.0
-
-
-class ModelInfo(Base, speckle_type=STRUCTURAL_ANALYSIS + "ModelInfo"):
-    name: Optional[str] = None
-    description: Optional[str] = None
-    projectNumber: Optional[str] = None
-    projectName: Optional[str] = None
-    settings: Optional[ModelSettings] = None
-    initials: Optional[str] = None
-    application: Optional[str] = None
-
-
-class Model(Base, speckle_type=STRUCTURAL_ANALYSIS + "Model"):
-    specs: Optional[ModelInfo] = None
-    nodes: Optional[List] = None
-    elements: Optional[List] = None
-    loads: Optional[List] = None
-    restraints: Optional[List] = None
-    properties: Optional[List] = None
-    materials: Optional[List] = None
-    layerDescription: Optional[str] = None
diff --git a/src/specklepy/objects/structural/axis.py b/src/specklepy/objects/structural/axis.py
deleted file mode 100644
index aa4408de..00000000
--- a/src/specklepy/objects/structural/axis.py
+++ /dev/null
@@ -1,17 +0,0 @@
-from enum import Enum
-from typing import Optional
-
-from specklepy.objects.base import Base
-from specklepy.objects.geometry import Plane
-
-
-class AxisType(int, Enum):
-    Cartesian = 0
-    Cylindrical = 1
-    Spherical = 2
-
-
-class Axis(Base, speckle_type="Objects.Structural.Geometry.Axis"):
-    name: Optional[str] = None
-    axisType: Optional[AxisType] = None
-    plane: Optional[Plane] = None
diff --git a/src/specklepy/objects/structural/geometry.py b/src/specklepy/objects/structural/geometry.py
deleted file mode 100644
index f232529b..00000000
--- a/src/specklepy/objects/structural/geometry.py
+++ /dev/null
@@ -1,110 +0,0 @@
-from enum import Enum
-from typing import List, Optional
-
-from specklepy.objects.base import Base
-from specklepy.objects.geometry import Line, Mesh, Plane, Point, Vector
-from specklepy.objects.structural.axis import Axis
-from specklepy.objects.structural.properties import (
-    Property1D,
-    Property2D,
-    Property3D,
-    PropertyDamper,
-    PropertyMass,
-    PropertySpring,
-)
-
-STRUCTURAL_GEOMETRY = "Objects.Structural.Geometry"
-
-
-class ElementType1D(int, Enum):
-    Beam = 0
-    Brace = 1
-    Bar = 2
-    Column = 3
-    Rod = 4
-    Spring = 5
-    Tie = 6
-    Strut = 7
-    Link = 8
-    Damper = 9
-    Cable = 10
-    Spacer = 11
-    Other = 12
-    Null = 13
-
-
-class ElementType2D(int, Enum):
-    Quad4 = 0
-    Quad8 = 1
-    Triangle3 = 2
-    Triangle6 = 3
-
-
-class ElementType3D(int, Enum):
-    Brick8 = 0
-    Wedge6 = 1
-    Pyramid5 = 2
-    Tetra4 = 3
-
-
-class Restraint(Base, speckle_type=STRUCTURAL_GEOMETRY + ".Restraint"):
-    code: Optional[str] = None
-    stiffnessX: float = 0.0
-    stiffnessY: float = 0.0
-    stiffnessZ: float = 0.0
-    stiffnessXX: float = 0.0
-    stiffnessYY: float = 0.0
-    stiffnessZZ: float = 0.0
-
-
-class Node(Base, speckle_type=STRUCTURAL_GEOMETRY + ".Node"):
-    name: Optional[str] = None
-    basePoint: Optional[Point] = None
-    constraintAxis: Optional[Axis] = None
-    restraint: Optional[Restraint] = None
-    springProperty: Optional[PropertySpring] = None
-    massProperty: Optional[PropertyMass] = None
-    damperProperty: Optional[PropertyDamper] = None
-
-
-class Element1D(Base, speckle_type=STRUCTURAL_GEOMETRY + ".Element1D"):
-    name: Optional[str] = None
-    baseLine: Optional[Line] = None
-    property: Optional[Property1D] = None
-    type: Optional[ElementType1D] = None
-    end1Releases: Optional[Restraint] = None
-    end2Releases: Optional[Restraint] = None
-    end1Offset: Optional[Vector] = None
-    end2Offset: Optional[Vector] = None
-    orientationNode: Optional[Node] = None
-    orinetationAngle: float = 0.0
-    localAxis: Optional[Plane] = None
-    parent: Optional[Base] = None
-    end1Node: Optional[Node] = None
-    end2Node: Optional[Node] = None
-    topology: Optional[List] = None
-    displayMesh: Optional[Mesh] = None
-
-
-class Element2D(Base, speckle_type=STRUCTURAL_GEOMETRY + ".Element2D"):
-    name: Optional[str] = None
-    property: Optional[Property2D] = None
-    type: Optional[ElementType2D] = None
-    offset: float = 0.0
-    orientationAngle: float = 0.0
-    parent: Optional[Base] = None
-    topology: Optional[List] = None
-    displayMesh: Optional[Mesh] = None
-
-
-class Element3D(Base, speckle_type=STRUCTURAL_GEOMETRY + ".Element3D"):
-    name: Optional[str] = None
-    baseMesh: Optional[Mesh] = None
-    property: Optional[Property3D] = None
-    type: Optional[ElementType3D] = None
-    orientationAngle: float = 0.0
-    parent: Optional[Base] = None
-    topology: List
-
-
-# class Storey needs ependency on built elements first
diff --git a/src/specklepy/objects/structural/loading.py b/src/specklepy/objects/structural/loading.py
deleted file mode 100644
index 9e6f1e59..00000000
--- a/src/specklepy/objects/structural/loading.py
+++ /dev/null
@@ -1,137 +0,0 @@
-from enum import Enum
-from typing import List, Optional
-
-from specklepy.objects.base import Base
-from specklepy.objects.geometry import Vector
-from specklepy.objects.structural.axis import Axis
-
-STRUCTURAL_LOADING = "Objects.Structural.Loading."
-
-
-class LoadType(int, Enum):
-    none = 0
-    Dead = 1
-    SuperDead = 2
-    Soil = 3
-    Live = 4
-    LiveRoof = 5
-    ReducibleLive = 6
-    Wind = 7
-    Snow = 8
-    Rain = 9
-    Thermal = 10
-    Notional = 11
-    Prestress = 12
-    Equivalent = 13
-    Accidental = 14
-    SeismicRSA = 15
-    SeismicAccTorsion = 16
-    SeismicStatic = 17
-    Other = 18
-
-
-class ActionType(int, Enum):
-    none = 0
-    Permanent = 1
-    Variable = 2
-    Accidental = 3
-
-
-class BeamLoadType(int, Enum):
-    Point = 0
-    Uniform = 1
-    Linear = 2
-    Patch = 3
-    TriLinear = 4
-
-
-class FaceLoadType(int, Enum):
-    Constant = 0
-    Variable = 1
-    Point = 2
-
-
-class LoadDirection2D(int, Enum):
-    X = 0
-    Y = 1
-    Z = 2
-
-
-class LoadDirection(int, Enum):
-    X = 0
-    Y = 1
-    Z = 2
-    XX = 3
-    YY = 4
-    ZZ = 5
-
-
-class LoadAxisType(int, Enum):
-    Global = 0
-    Local = 1  # local element axes
-    DeformedLocal = (
-        2  # element local axis that is embedded in the element as it deforms
-    )
-
-
-class CombinationType(int, Enum):
-    LinearAdd = 0
-    Envelope = 1
-    AbsoluteAdd = 2
-    SRSS = 3
-    RangeAdd = 4
-
-
-class LoadCase(Base, speckle_type=STRUCTURAL_LOADING + "LoadCase"):
-    name: Optional[str] = None
-    loadType: Optional[LoadType] = None
-    group: Optional[str] = None
-    actionType: Optional[ActionType] = None
-    description: Optional[str] = None
-
-
-class Load(Base, speckle_type=STRUCTURAL_LOADING + "Load"):
-    name: Optional[str] = None
-    loadCase: Optional[LoadCase] = None
-
-
-class LoadBeam(Load, speckle_type=STRUCTURAL_LOADING + "LoadBeam"):
-    elements: Optional[List] = None
-    loadType: Optional[BeamLoadType] = None
-    direction: Optional[LoadDirection] = None
-    loadAxis: Optional[Axis] = None
-    loadAxisType: Optional[LoadAxisType] = None
-    isProjected: Optional[bool] = None
-    values: Optional[List] = None
-    positions: Optional[List] = None
-
-
-class LoadCombinations(Base, speckle_type=STRUCTURAL_LOADING + "LoadCombination"):
-    name: Optional[str] = None
-    loadCases: List
-    loadFactors: List
-    combinationType: CombinationType
-
-
-class LoadFace(Load, speckle_type=STRUCTURAL_LOADING + "LoadFace"):
-    elements: Optional[List] = None
-    loadType: Optional[FaceLoadType] = None
-    direction: Optional[LoadDirection2D] = None
-    loadAxis: Optional[Axis] = None
-    loadAxisType: Optional[LoadAxisType] = None
-    isProjected: Optional[bool] = None
-    values: Optional[List] = None
-    positions: Optional[List] = None
-
-
-class LoadGravity(Load, speckle_type=STRUCTURAL_LOADING + "LoadGravity"):
-    elements: Optional[List] = None
-    nodes: Optional[List] = None
-    gravityFactors: Optional[Vector] = None
-
-
-class LoadNode(Load, speckle_type=STRUCTURAL_LOADING + "LoadNode"):
-    nodes: Optional[List] = None
-    loadAxis: Optional[Axis] = None
-    direction: Optional[LoadDirection] = None
-    value: float = 0.0
diff --git a/src/specklepy/objects/structural/materials.py b/src/specklepy/objects/structural/materials.py
deleted file mode 100644
index ab0abcda..00000000
--- a/src/specklepy/objects/structural/materials.py
+++ /dev/null
@@ -1,61 +0,0 @@
-from enum import Enum
-from typing import Optional
-
-from specklepy.objects.base import Base
-
-STRUCTURAL_MATERIALS = "Objects.Structural.Materials"
-
-
-class MaterialType(int, Enum):
-    Concrete = 0
-    Steel = 1
-    Timber = 2
-    Aluminium = 3
-    Masonry = 4
-    FRP = 5
-    Glass = 6
-    Fabric = 7
-    Rebar = 8
-    Tendon = 9
-    ColdFormed = 10
-    Other = 11
-
-
-class StructuralMaterial(
-    Base, speckle_type=STRUCTURAL_MATERIALS + ".StructuralMaterial"
-):
-    name: Optional[str] = None
-    grade: Optional[str] = None
-    materialType: Optional[MaterialType] = None
-    designCode: Optional[str] = None
-    codeYear: Optional[str] = None
-    strength: float = 0.0
-    elasticModulus: float = 0.0
-    poissonsRatio: float = 0.0
-    shearModulus: float = 0.0
-    density: float = 0.0
-    thermalExpansivity: float = 0.0
-    dampingRatio: float = 0.0
-    cost: float = 0.0
-    materialSafetyFactor: float = 0.0
-
-
-class Concrete(StructuralMaterial):
-    compressiveStrength: float = 0.0
-    tensileStrength: float = 0.0
-    flexuralStrength: float = 0.0
-    maxCompressiveStrain: float = 0.0
-    maxTensileStrain: float = 0.0
-    maxAggregateSize: float = 0.0
-    lightweight: Optional[bool] = None
-
-
-class Steel(StructuralMaterial, speckle_type=STRUCTURAL_MATERIALS + ".Steel"):
-    yieldStrength: float = 0.0
-    ultimateStrength: float = 0.0
-    maxStrain: float = 0.0
-    strainHardeningModulus: float = 0.0
-
-
-class Timber(StructuralMaterial, speckle_type=STRUCTURAL_MATERIALS + ".Timber"):
-    species: Optional[str] = None
diff --git a/src/specklepy/objects/structural/properties.py b/src/specklepy/objects/structural/properties.py
deleted file mode 100644
index e0153a1e..00000000
--- a/src/specklepy/objects/structural/properties.py
+++ /dev/null
@@ -1,212 +0,0 @@
-from enum import Enum
-from typing import Optional
-
-from specklepy.objects.base import Base
-from specklepy.objects.structural.axis import Axis
-from specklepy.objects.structural.materials import StructuralMaterial
-
-STRUCTURAL_PROPERTY = "Objects.Structural.Properties"
-
-
-class MemberType(int, Enum):
-    Beam = 0
-    Column = 1
-    Generic1D = 2
-    Slab = 3
-    Wall = 4
-    Generic2D = 5
-    VoidCutter1D = 6
-    VoidCutter2D = 7
-
-
-class BaseReferencePoint(int, Enum):
-    Centroid = 0
-    TopLeft = 1
-    TopCentre = 2
-    TopRight = 3
-    MidLeft = 4
-    MidRight = 5
-    BotLeft = 6
-    BotCentre = 7
-    BotRight = 8
-
-
-class ReferenceSurface(int, Enum):
-    Top = 0
-    Middle = 1
-    Bottom = 2
-
-
-class PropertyType2D(int, Enum):
-    Stress = 0
-    Fabric = 1
-    Plate = 2
-    Shell = 3
-    Curved = 4
-    Wall = 5
-    Strain = 6
-    Axi = 7
-    Load = 8
-
-
-class PropertyType3D(int, Enum):
-    Solid = 0
-    Infinite = 1
-
-
-class ShapeType(int, Enum):
-    Rectangular = 0
-    Circular = 1
-    I = 2  # noqa: E741
-    Tee = 3
-    Angle = 4
-    Channel = 5
-    Perimeter = 6
-    Box = 7
-    Catalogue = 8
-    Explicit = 9
-    Undefined = 10
-
-
-class PropertyTypeSpring(int, Enum):
-    Axial = 0
-    Torsional = 1
-    General = 2
-    Matrix = 3
-    TensionOnly = 4
-    CompressionOnly = 5
-    Connector = 6
-    LockUp = 7
-    Gap = 8
-    Friction = 9
-
-
-class PropertyTypeDamper(int, Enum):
-    Axial = 0
-    Torsional = 1
-    General = 2
-
-
-class Property(Base, speckle_type=STRUCTURAL_PROPERTY):
-    name: Optional[str] = None
-
-
-class SectionProfile(
-    Base, speckle_type=STRUCTURAL_PROPERTY + ".Profiles.SectionProfile"
-):
-    name: Optional[str] = None
-    shapeType: Optional[ShapeType] = None
-    area: float = 0.0
-    Iyy: float = 0.0
-    Izz: float = 0.0
-    J: float = 0.0
-    Ky: float = 0.0
-    weight: float = 0.0
-
-
-class Property1D(Property, speckle_type=STRUCTURAL_PROPERTY + ".Property1D"):
-    memberType: Optional[MemberType] = None
-    material: Optional[StructuralMaterial] = None
-    profile: Optional[SectionProfile] = None
-    referencePoint: Optional[BaseReferencePoint] = None
-    offsetY: float = 0.0
-    offsetZ: float = 0.0
-
-
-class Property2D(Property, speckle_type=STRUCTURAL_PROPERTY + ".Property2D"):
-    type: Optional[PropertyType2D] = None
-    thickness: float = 0.0
-    material: Optional[StructuralMaterial] = None
-    orientationAxis: Optional[Axis] = None
-    refSurface: Optional[ReferenceSurface] = None
-    zOffset: float = 0.0
-    modifierInPlane: float = 0.0
-    modifierBending: float = 0.0
-    modifierShear: float = 0.0
-    modifierVolume: float = 0.0
-
-
-class Property3D(Property, speckle_type=STRUCTURAL_PROPERTY + ".Property3D"):
-    type: Optional[PropertyType3D] = None
-    material: Optional[StructuralMaterial] = None
-    orientationAxis: Optional[Axis] = None
-
-
-class PropertyDamper(Property, speckle_type=STRUCTURAL_PROPERTY + ".PropertyDamper"):
-    damperType: Optional[PropertyTypeDamper] = None
-    dampingX: float = 0.0
-    dampingY: float = 0.0
-    dampingZ: float = 0.0
-    dampingXX: float = 0.0
-    dampingYY: float = 0.0
-    dampingZZ: float = 0.0
-
-
-class PropertyMass(Property, speckle_type=STRUCTURAL_PROPERTY + ".PropertyMass"):
-    mass: float = 0.0
-    inertiaXX: float = 0.0
-    inertiaYY: float = 0.0
-    inertiaZZ: float = 0.0
-    inertiaXY: float = 0.0
-    inertiaYZ: float = 0.0
-    inertiaZX: float = 0.0
-    massModified: Optional[bool] = None
-    massModifierX: float = 0.0
-    massModifierY: float = 0.0
-    massModifierZ: float = 0.0
-
-
-class PropertySpring(Property, speckle_type=STRUCTURAL_PROPERTY + ".PropertySpring"):
-    springType: Optional[PropertyTypeSpring] = None
-    springCurveX: float = 0.0
-    stiffnessX: float = 0.0
-    springCurveY: float = 0.0
-    stiffnessY: float = 0.0
-    springCurveZ: float = 0.0
-    stiffnessZ: float = 0.0
-    springCurveXX: float = 0.0
-    stiffnessXX: float = 0.0
-    springCurveYY: float = 0.0
-    stiffnessYY: float = 0.0
-    springCurveZZ: float = 0.0
-    stiffnessZZ: float = 0.0
-    dampingRatio: float = 0.0
-    dampingX: float = 0.0
-    dampingY: float = 0.0
-    dampingZ: float = 0.0
-    dampingXX: float = 0.0
-    dampingYY: float = 0.0
-    dampingZZ: float = 0.0
-    matrix: float = 0.0
-    postiveLockup: float = 0.0
-    frictionCoefficient: float = 0.0
-
-
-class ReferenceSurfaceEnum(int, Enum):
-    Concrete = 0
-    Steel = 1
-    Timber = 2
-    Aluminium = 3
-    Masonry = 4
-    FRP = 5
-    Glass = 6
-    Fabric = 7
-    Rebar = 8
-    Tendon = 9
-    ColdFormed = 10
-    Other = 11
-
-
-class shapeType(int, Enum):
-    Concrete = 0
-    Steel = 1
-    Timber = 2
-    Aluminium = 3
-    Masonry = 4
-    FRP = 5
-    Glass = 6
-    Fabric = 7
-    Rebar = 8
-    Tendon = 9
-    ColdFormed = 10
-    Other = 11
diff --git a/src/specklepy/objects/structural/results.py b/src/specklepy/objects/structural/results.py
deleted file mode 100644
index d014f458..00000000
--- a/src/specklepy/objects/structural/results.py
+++ /dev/null
@@ -1,172 +0,0 @@
-from typing import List, Optional
-
-from specklepy.objects.base import Base
-from specklepy.objects.structural.analysis import Model
-from specklepy.objects.structural.geometry import Element1D, Element2D, Element3D, Node
-
-STRUCTURAL_RESULTS = "Objects.Structural.Results."
-
-
-class Result(Base, speckle_type=STRUCTURAL_RESULTS + "Result"):
-    resultCase: Optional[Base] = None
-    permutation: Optional[str] = None
-    description: Optional[str] = None
-
-
-class ResultSet1D(Result, speckle_type=STRUCTURAL_RESULTS + "ResultSet1D"):
-    results1D: List
-
-
-class Result1D(Result, speckle_type=STRUCTURAL_RESULTS + "Result1D"):
-    element: Optional[Element1D] = None
-    position: Optional[float] = None
-    dispX: Optional[float] = None
-    dispY: Optional[float] = None
-    dispZ: Optional[float] = None
-    rotXX: Optional[float] = None
-    rotYY: Optional[float] = None
-    rotZZ: Optional[float] = None
-    forceX: Optional[float] = None
-    forceY: Optional[float] = None
-    forceZ: Optional[float] = None
-    momentXX: Optional[float] = None
-    momentYY: Optional[float] = None
-    momentZZ: Optional[float] = None
-    axialStress: Optional[float] = None
-    shearStressY: Optional[float] = None
-    shearStressZ: Optional[float] = None
-    bendingStressYPos: Optional[float] = None
-    bendingStressYNeg: Optional[float] = None
-    bendingStressZPos: Optional[float] = None
-    bendingStressZNeg: Optional[float] = None
-    combinedStressMax: Optional[float] = None
-    combinedStressMin: Optional[float] = None
-
-
-class ResultSet2D(Result, speckle_type=STRUCTURAL_RESULTS + "ResultSet2D"):
-    results2D: List
-
-
-class Result2D(Result, speckle_type=STRUCTURAL_RESULTS + "Result2D"):
-    element: Optional[Element2D] = None
-    position: List
-    dispX: Optional[float] = None
-    dispY: Optional[float] = None
-    dispZ: Optional[float] = None
-    forceXX: Optional[float] = None
-    forceYY: Optional[float] = None
-    forceXY: Optional[float] = None
-    momentXX: Optional[float] = None
-    momentYY: Optional[float] = None
-    momentXY: Optional[float] = None
-    shearX: Optional[float] = None
-    shearY: Optional[float] = None
-    stressTopXX: Optional[float] = None
-    stressTopYY: Optional[float] = None
-    stressTopZZ: Optional[float] = None
-    stressTopXY: Optional[float] = None
-    stressTopYZ: Optional[float] = None
-    stressTopZX: Optional[float] = None
-    stressMidXX: Optional[float] = None
-    stressMidYY: Optional[float] = None
-    stressMidZZ: Optional[float] = None
-    stressMidXY: Optional[float] = None
-    stressMidYZ: Optional[float] = None
-    stressMidZX: Optional[float] = None
-    stressBotXX: Optional[float] = None
-    stressBotYY: Optional[float] = None
-    stressBotZZ: Optional[float] = None
-    stressBotXY: Optional[float] = None
-    stressBotYZ: Optional[float] = None
-    stressBotZX: Optional[float] = None
-
-
-class ResultSet3D(Result, speckle_type=STRUCTURAL_RESULTS + "ResultSet3D"):
-    results3D: List
-
-
-class Result3D(Result, speckle_type=STRUCTURAL_RESULTS + "Result3D"):
-    element: Optional[Element3D] = None
-    position: List
-    dispX: Optional[float] = None
-    dispY: Optional[float] = None
-    dispZ: Optional[float] = None
-    stressXX: Optional[float] = None
-    stressYY: Optional[float] = None
-    stressZZ: Optional[float] = None
-    stressXY: Optional[float] = None
-    stressYZ: Optional[float] = None
-    stressZX: Optional[float] = None
-
-
-class ResultGlobal(Result, speckle_type=STRUCTURAL_RESULTS + "ResultGlobal"):
-    model: Optional[Model] = None
-    loadX: Optional[float] = None
-    loadY: Optional[float] = None
-    loadZ: Optional[float] = None
-    loadXX: Optional[float] = None
-    loadYY: Optional[float] = None
-    loadZZ: Optional[float] = None
-    reactionX: Optional[float] = None
-    reactionY: Optional[float] = None
-    reactionZ: Optional[float] = None
-    reactionXX: Optional[float] = None
-    reactionYY: Optional[float] = None
-    reactionZZ: Optional[float] = None
-    mode: Optional[float] = None
-    frequency: Optional[float] = None
-    loadFactor: Optional[float] = None
-    modalStiffness: Optional[float] = None
-    modalGeoStiffness: Optional[float] = None
-    effMassX: Optional[float] = None
-    effMassY: Optional[float] = None
-    effMassZ: Optional[float] = None
-    effMassXX: Optional[float] = None
-    effMassYY: Optional[float] = None
-    effMassZZ: Optional[float] = None
-
-
-class ResultSetNode(Result, speckle_type=STRUCTURAL_RESULTS + "ResultSetNode"):
-    resultsNode: List
-
-
-class ResultNode(Result, speckle_type=STRUCTURAL_RESULTS + " ResultNode"):
-    node: Optional[Node] = None
-    dispX: Optional[float] = None
-    dispY: Optional[float] = None
-    dispZ: Optional[float] = None
-    rotXX: Optional[float] = None
-    rotYY: Optional[float] = None
-    rotZZ: Optional[float] = None
-    reactionX: Optional[float] = None
-    reactionY: Optional[float] = None
-    reactionZ: Optional[float] = None
-    reactionXX: Optional[float] = None
-    reactionYY: Optional[float] = None
-    reactionZZ: Optional[float] = None
-    constraintX: Optional[float] = None
-    constraintY: Optional[float] = None
-    constraintZ: Optional[float] = None
-    constraintXX: Optional[float] = None
-    constraintYY: Optional[float] = None
-    constraintZZ: Optional[float] = None
-    velX: Optional[float] = None
-    velY: Optional[float] = None
-    velZ: Optional[float] = None
-    velXX: Optional[float] = None
-    velYY: Optional[float] = None
-    velZZ: Optional[float] = None
-    accX: Optional[float] = None
-    accY: Optional[float] = None
-    accZ: Optional[float] = None
-    accXX: Optional[float] = None
-    accYY: Optional[float] = None
-    accZZ: Optional[float] = None
-
-
-class ResultSetAll(Base, speckle_type=None):
-    resultSet1D: Optional[ResultSet1D] = None
-    resultSet2D: Optional[ResultSet2D] = None
-    resultSet3D: Optional[ResultSet3D] = None
-    resultsGlobal: Optional[ResultGlobal] = None
-    resultsNode: Optional[ResultSetNode] = None
diff --git a/tests/unit/test_instances.py b/tests/unit/test_instances.py
new file mode 100644
index 00000000..7d55ca10
--- /dev/null
+++ b/tests/unit/test_instances.py
@@ -0,0 +1,38 @@
+# pylint: disable=redefined-outer-name
+import pytest
+
+from specklepy.core.api.models.instances import InstanceDefinitionProxy, InstanceProxy
+
+
+@pytest.fixture()
+def instance_proxy():
+    return InstanceProxy(
+        definitionId="definitionId", transform=[1, 23.5], units="unit", maxDepth=3
+    )
+
+
+@pytest.fixture()
+def instance_definition_proxy():
+    return InstanceDefinitionProxy(
+        objects=["app_id_1", "app_id_2"], maxDepth=2, name="group_proxy_name"
+    )
+
+
+def test_create_instance_proxy():
+    try:
+        InstanceProxy(definitionId="", transform="", units="", maxDepth=1)  # wrong type
+        assert False
+    except TypeError:
+        assert True
+    except:
+        assert False
+
+
+def test_create_instance_definition_proxy():
+    try:
+        InstanceDefinitionProxy(objects="", maxDepth=1, name="")  # wrong type
+        assert False
+    except TypeError:
+        assert True
+    except:
+        assert False
diff --git a/tests/unit/test_proxies.py b/tests/unit/test_proxies.py
new file mode 100644
index 00000000..08224c52
--- /dev/null
+++ b/tests/unit/test_proxies.py
@@ -0,0 +1,59 @@
+# pylint: disable=redefined-outer-name
+import pytest
+
+from specklepy.core.api.models.proxies import ColorProxy, GroupProxy
+from specklepy.objects.other import RenderMaterial, RenderMaterialProxy
+
+
+@pytest.fixture()
+def color_proxy():
+    return ColorProxy(
+        objects=["app_id_1", "app_id_2"], value=11111, name="color_proxy_name"
+    )
+
+
+@pytest.fixture()
+def group_proxy():
+    return GroupProxy(objects=["app_id_1", "app_id_2"], name="group_proxy_name")
+
+
+@pytest.fixture()
+def material():
+    return RenderMaterial(
+        name="name", opacity=0.3, metalness=0, roughness=0, diffuse=1, emissive=1
+    )
+
+
+@pytest.fixture()
+def material_proxy():
+    return RenderMaterialProxy(objects=["app_id_1", "app_id_2"], value=material())
+
+
+def test_create_color_proxy():
+    try:
+        ColorProxy(objects="", value=2, name="")  # wrong type
+        assert False
+    except TypeError:
+        assert True
+    except:
+        assert False
+
+
+def test_create_group_proxy():
+    try:
+        GroupProxy(objects="", name="")  # wrong type
+        assert False
+    except TypeError:
+        assert True
+    except:
+        assert False
+
+
+def test_create_material_proxy():
+    try:
+        RenderMaterialProxy(objects="", name="")  # wrong type
+        assert False
+    except TypeError:
+        assert True
+    except:
+        assert False
diff --git a/tests/unit/test_registering_base.py b/tests/unit/test_registering_base.py
index fddfcb73..7c9fc094 100644
--- a/tests/unit/test_registering_base.py
+++ b/tests/unit/test_registering_base.py
@@ -3,7 +3,7 @@
 import pytest
 
 from specklepy.objects.base import Base
-from specklepy.objects.structural import Concrete
+from specklepy.objects.geometry import Line
 
 
 class Foo(Base):
@@ -29,8 +29,8 @@ class Baz(Bar):
             "Tests.Unit.TestRegisteringBase.Foo:Custom.Bar:Tests.Unit.TestRegisteringBase.Baz",
         ),
         (
-            Concrete,
-            "Objects.Structural.Materials.StructuralMaterial:Objects.Structural.Materials.Concrete",
+            Line,
+            "Objects.Geometry.Line",
         ),
     ],
 )
@@ -43,7 +43,7 @@ def test_determine_speckle_type(klass: Type[Base], speckle_type: str):
     [
         (Base, "Base"),
         (Foo, "Tests.Unit.TestRegisteringBase.Foo"),
-        (Concrete, "Objects.Structural.Materials.Concrete"),
+        (Line, "Objects.Geometry.Line"),
     ],
 )
 def test_full_name(klass: Type[Base], fully_qualified_name: str):
diff --git a/tests/unit/test_structural.py b/tests/unit/test_structural.py
deleted file mode 100644
index 84de472f..00000000
--- a/tests/unit/test_structural.py
+++ /dev/null
@@ -1,143 +0,0 @@
-import pytest
-
-from specklepy.objects.geometry import Line, Mesh, Point, Vector
-from specklepy.objects.structural.analysis import Model
-from specklepy.objects.structural.geometry import (
-    Element1D,
-    Element2D,
-    ElementType1D,
-    ElementType2D,
-    Node,
-    Restraint,
-)
-from specklepy.objects.structural.loading import LoadGravity
-from specklepy.objects.structural.materials import StructuralMaterial
-from specklepy.objects.structural.properties import (
-    MemberType,
-    Property1D,
-    Property2D,
-    SectionProfile,
-    ShapeType,
-)
-
-
-@pytest.fixture()
-def point():
-    return Point(x=1, y=10, z=0)
-
-
-@pytest.fixture()
-def vector():
-    return Vector(x=0, y=0, z=-1)
-
-
-@pytest.fixture()
-def line(point, interval):
-    return Line(
-        start=point,
-        end=point,
-        domain=interval,
-        # These attributes are not handled in C#
-        # bbox=None,
-        # length=None
-    )
-
-
-@pytest.fixture()
-def mesh(box):
-    return Mesh(
-        vertices=[2, 1, 2, 4, 77.3, 5, 33, 4, 2],
-        faces=[1, 2, 3, 4, 5, 6, 7],
-        colors=[111, 222, 333, 444, 555, 666, 777],
-        bbox=box,
-        area=233,
-        volume=232.2,
-    )
-
-
-@pytest.fixture()
-def restraint():
-    return Restraint(code="FFFFFF")
-
-
-@pytest.fixture()
-def node(restraint, point):
-    return Node(basePoint=point, restraint=restraint, name="node1")
-
-
-@pytest.fixture()
-def material():
-    return StructuralMaterial(name="TestMaterial")
-
-
-@pytest.fixture()
-def memberType():
-    return MemberType(0)
-
-
-@pytest.fixture()
-def shapeType():
-    return ShapeType(8)
-
-
-@pytest.fixture()
-def sectionProfile(shapeType):
-    return SectionProfile(name="Test", shapeType=shapeType)
-
-
-@pytest.fixture()
-def property1D(memberType, sectionProfile, material):
-    return Property1D(
-        Material=material,
-        SectionProfile=sectionProfile,
-        memberType=memberType,
-    )
-
-
-@pytest.fixture()
-def elementType1D():
-    return ElementType1D(0)
-
-
-@pytest.fixture()
-def element1D(line, restraint, elementType1D, property1D):
-    return Element1D(
-        baseLine=line,
-        end1Releases=restraint,
-        end2Releases=restraint,
-        type=elementType1D,
-        property=property1D,
-    )
-
-
-@pytest.fixture()
-def property2D(material):
-    return Property2D(Material=material)
-
-
-@pytest.fixture()
-def elementType2D():
-    return ElementType2D(0)
-
-
-@pytest.fixture()
-def element2D(point, elementType2D):
-    return Element2D(
-        topology=[point],
-        type=elementType2D,
-    )
-
-
-@pytest.fixture()
-def loadGravity(element1D, element2D, vector):
-    return LoadGravity(elements=[element1D, element2D], gravityFactors=vector)
-
-
-@pytest.fixture()
-def model(loadGravity, element1D, element2D, material, property1D, property2D):
-    return Model(
-        loads=[loadGravity],
-        elements=[element1D, element2D],
-        materials=[material],
-        properties=[property1D, property2D],
-    )