Hi Emmanuel - if I could figure out how to attach images to this post, I'd show you! Good tip on the .mtl though, thanks I'll check it out - it's possible they weren't sent to me.

Hope to get it working - I really don't want to re-train myself with SketchUp, as Sweet Home 3D is so easy to work with! (could do with negative elevations though, but there are a few posts on that and how to get around it already )

Cheers, James