I think it might be a problem. I don't use Solidworks, but I use a similar 3d engineering application. There doesn't seem to be any good way to get the files from the common engineering formats to Poser. Unfortunately.

If he can export in DXF format, you can try importing the model into Poser. However, I've found that rather buggy. Try it with a model he's already made, and see if it's worth it.