I would like to cover up some parts of a sci-fi set that aren't built in, and I want to use cgi only as a last resort. Matte paintings are typically for exteriors or very large interiors, does it make sense to shoot matte shots for a small-ish interior? The space is about 35 x 20 feet and the set walls are between 7-8 feet high, but the space itself has high ceilings that I want to cover with a matte.
These are some demo walls I made when I was considering doing the whole thing with miniatures and animation. I was going to make some more of them, cut them to fit the mattes and then shoot them in forced perspective and soft focus so they look believable. The second picture is a rough outline of a matte shot. The purple border is the boundary of the set, the camera will be slightly above where the actors are standing. The actual shot will be taken farther away, from ~25 feet away from the actors using a normal lens. The area shaded in red is part of walls/ceiling that I want to matte out, part of the ceiling actually slopes down on an angle between the camera and the actors.
Do I have to use glass or can I use acrylic?