Hi folks, I’m thinking of building my own wheel house this spring because they seem crazy over priced and I just need something simple. I’m thinking of buying a crank down trailer frame, use 2x2s for the wall framing, plywood floor with rubber coating, and getting it spray foam insulated and just leaving it rough on the inside. Any downsides to this thought process? Do I need to plan plywood for the outside walls instead of just spray foaming directly to the aluminum siding?