Been thinking about what I need for a pickup bed for my ratrod.. Painting my older garden cart, I noticed the construction and looks is about par with an 'early' pickup bed. Now mine is way to small ( 10CF ). 30x36x12 but Ohio steel and Agrifab both make carts which are perfect size for my Ratrod, at 60x34x15 ( 17 CF )..
If I rework the tailgate, and rework the lip on the front. I should be able to cut the bed off the frame really easy ( non continuous welds ).. Add some trailer fenders and it should look pretty good.. As far as the price goes. There $360ish. If I built somthing, I would need a sheet of 18ga at least, and some sticks of 1"x1" 16ga tubing. probably come close to that price + the time to put it togther..