The edges on the opening should fillet to .9" The thickness of the shell is over 2"RhinoHelp.3dm (1.1 MB)
Hello - it will work but you need to clean the model up a little - I’d first set the model tolerance to .001 feet. .01 is too large for fillets at .9" Make that top surface one face and then MergeAllFaces to clean up coplanar faces.
RhinoHelp_PG.3dm (814.4 KB)
OffsetHelp.3dm (221.3 KB)
Thank you! Now I am trying to OffsetSrf this facing inwards like 1.5-2" but the tolerance change isnt helping.