Thanks for the replies Pilou and Michael.

I do understand about Moi not editing the poly meshes, I just wanted them as size guides for completely new geometry built in Moi. As I said, that came over in Rhino but sadly not in Moi. I did try OBJto3DM but that too, seemed to give me no data that I could see in Moi. Although I am doing this on a Mac via Parallels so any number of things could be getting stuck in translation. I'll give Pilou's suggestion a go and report back. Thanks again.