Originally Posted by
UberEmu
I was also thinking about possibly going for a thin mountain bike frame with 700c wheels. Is that possible?
Thin? Do you mean CroMo? I'd be all for that but if the frame isn't a 29er you would be pushing poo poo up hill to fit 700mm rims.
Just buy a used rigid framed hybrid like a Surly and don't worry about building one. If you want a project just strip it and rebuild it with new cables, grease and pads etc.