I just realized that my car (67 BJ8) is missing the rear back seat panel. Ok, no big deal I'll just order one from Moss. I fell out of my seat, the thing is over $500! Isn't it just plywood or plastic covered with foam and vinyl with a few buttons and swivels? Has anyone made one of tear one apart so you can tell me what it's constructed of? I would rather spend the $500 on other more essential things. Thanks!