Not really asking this from an indy POV here, more of a "guy who doesn't know much about how movies are made to people who do know how movies are made" POV. How does set making work? If they're making a big interior from scratch, do they use scaffolding or what? Is it mostly plywood underneath the pretty surfaces of a sci-fi set? How would you go about making an entire set that looks like it's made of weathered iron or steel? Marble? I suppose there are different methods, depending on whether it's going to be walked on, or just looked at?