The only thing that bugs me about this idea is 3/4" plywood. I understand you need it to hold it's shape, but man, that's a LOT of weight goin' on, eh?
Couldn't you go thinner if you used a good quality marine plywood? Or even a quality, well dried, hardwood?
I've ben entertaining ideas about a similar idea for the bed of my 54, only I'm not thinking about a removable deal ... just doing the bed up in wood -- sides, too -- with my spare tire side-mounted on the inside
of the bed.
Anyway, I've been wondering how thin I can go, especially with a bed cover, and not have any warping going on.
54 Chevy Pickup