Mikes got the idea with coating the MDF, or any cheaper grade plywood for that matter. We did speaker enclosures in pickups back in the day in the bed called blow-thrus and we just bedlined the shit out of em and let em ride. Im subbed to this thread, wanna see what you decide, ive been thinking about some sort of enclosure for the LJ, either up against the back of the front seats (bc im afraid someones gonna jack my sub and amp), or a really shallow drawer-type system for the entire floor...