Hi Peer,

re this part:
> I'm surprised by the prohibition on solid bodies being stitched together since I didn't think that was a thing in the first place.

Yeah that's kind of a strange thing to say. Usually that term "stitched" means surfaces being attached to each other along a shared edge.

I think they just mean that they don't want multiple solids to be packaged together in a single STEP file.

- Michael