diff --git a/src/rtems_proxy/copy.py b/src/rtems_proxy/copy.py
index 5b2736c..67dbf0f 100644
--- a/src/rtems_proxy/copy.py
+++ b/src/rtems_proxy/copy.py
@@ -13,19 +13,19 @@ def copy_rtems():
     """
     Copy RTEMS binaries to a location where the RTEMS IOC can access them
     """
-    root = GLOBALS.RTEMS_ROOT / GLOBALS.IOC_GROUP / GLOBALS.IOC_NAME
-    ioc_bins = GLOBALS.IOC / "bin" / GLOBALS.EPICS_TARGET_ARCH
+    root = GLOBALS.RTEMS_ROOT
+    ioc_bins = (GLOBALS.IOC / "bin") / GLOBALS.EPICS_TARGET_ARCH
     bin_dest = root / "bin"
 
     # because we are moving the ioc files we need to fix up startup script paths
-    startup = GLOBALS.IOC / "st.cmd"
+    startup = GLOBALS.RUNTIME / "st.cmd"
     cmd_txt = startup.read_text()
     cmd_txt = re.sub("/epics/", str(root), cmd_txt)
     startup.write_text(cmd_txt)
 
     # move all the files needed for runtime into the PVC that is being shared
     # over nfs/tftp by the nfsv2-tftp service
-    shutil.copytree(GLOBALS.IOC, root, symlinks=True)
-    shutil.copytree(GLOBALS.RUNTIME, root)
+    shutil.copytree(GLOBALS.IOC, root / "ioc", symlinks=True, dirs_exist_ok=True)
+    shutil.copytree(GLOBALS.RUNTIME, root / "runtime", dirs_exist_ok=True)
     Path.mkdir(bin_dest, exist_ok=True)
     shutil.move(ioc_bins / "ioc.boot", bin_dest)
diff --git a/src/rtems_proxy/globals.py b/src/rtems_proxy/globals.py
index 8ee26b7..35e346c 100644
--- a/src/rtems_proxy/globals.py
+++ b/src/rtems_proxy/globals.py
@@ -20,21 +20,15 @@ def __init__(self) -> None:
 
         self.RUNTIME = self.EPICS_ROOT / "runtime"
 
-        self.EPICS_HOST_ARCH = os.getenv("EPICS_HOST_ARCH")
+        self.EPICS_HOST_ARCH = os.getenv("EPICS_HOST_ARCH", DEFAULT_ARCH)
         """ Host architecture """
 
-        self.EPICS_TARGET_ARCH = os.getenv("EPICS_TARGET_ARCH")
+        self.EPICS_TARGET_ARCH = os.getenv("EPICS_TARGET_ARCH", DEFAULT_ARCH)
         """ Cross compilation target architecture """
 
-        self.IOC = os.getenv("IOC")
+        self.IOC = Path(os.getenv("IOC", self.EPICS_ROOT / "ioc"))
         """ The root folder for IOC source and binaries """
 
-        self.EPICS_HOST_ARCH = os.getenv("EPICS_HOST_ARCH")
-        """ Host architecture """
-
-        self.EPICS_HOST_ARCH = os.getenv("EPICS_HOST_ARCH")
-        """ Host architecture """
-
         # TODO in future, shall we drop the RTEMS prefix and make this module
         # generic?
 
@@ -59,10 +53,10 @@ def __init__(self) -> None:
         self.RTEMS_CONSOLE = os.getenv("RTEMS_CONSOLE", "NO_CONSOLE")
         """ address:port to connect to the IOC console """
 
-        self.IOC_NAME = os.getenv("IOC_NAME")
+        self.IOC_NAME = os.getenv("IOC_NAME", "NO_IOC_NAME")
         """ the name of this IOC """
 
-        self.IOC_GROUP = os.getenv("IOC_GROUP")
+        self.IOC_GROUP = os.getenv("IOC_GROUP", "NO_IOC_GROUP")
         """ the name of the repository that this IOC is grouped into """