And where do you get movable walls at? Does the company provide them or do you actually come up with the idea of finding them and using them?
That's basically just black mattboard from any art supply store. The clamps, though, are custom made and not commercially available. You start with a 5/8 to 1/4-20 adapter and hotshoe ball joint, both available at most camera stores and then the top part is machined out of aluminum. I may just get a small milling machine to start making my own.
The walls were built by the furniture manufacturer (Not Portable). I've also hired set builders to do walls like that. They're typically 6'x10' or 4'x8' with drywall over a frame of 1x4's with right angle jacks screwed to the back and sandbagged. We even hung some of the walls horizontally from C Stands to play with the planes a bit.
I actually really enjoyed composing the walls. I'm usually at the mercy of the architecture... not this time! It does require some pre-visualization and I found that challenge to be kind of exciting.
-CB