Had a crazy idea! Replace the long gone Coroplast with an array of the steel studs! It's only made from 25 gauge but since it's shaped, it will be just as structurally strong as a thicker gauge. The overall weight might be close to using the metal sheets but the studs will be easier to change out if needed. Cost is easily half as using the metal sheets.
If I need to reinforce anything, I can easily stack the reinforcement studs on top of the other ones making a boxed stud. I'll probably do that fer the outer portions of the frame.