[pound41]

problem you will have with birch plywood or anything less bendable than cardboard is the slight curve at the front where the bracket ends and the panel screws to the side of the bed. I have good panels but want to add speakers so I am making birch panels that I am staining. I guess you could score the back of the plywood like I have seen done with drywall and plywood in building archways
but they weren't going to be removed like your panels will. I hope others smarter than I might jump in and tell us how do do it
Good Luck