Got a new mazda to build and quite a few questions.

Well I sold my other mazda and I am trying to finish up my mitsu but I found another mazda that I couldnt pass up. Its an 88 2200 with a 200o engine. The cab forward is great, it just needed a fuel pump to run "the diaphrame busted and put gas in the motor which led the guy to see it to me cuz he said it needed a carb, its got grey interior and all in all a great deal for 100 bucks. Heck it even has a.c. But the bed floor is gone and i dont think I can salvage the rear frame. I have thought about clipping it but well see. I was wondering if anyone had a frame for a shortbed or if anyone had a long bed they would part with? My friend has a longbed frame and I may just build it. Thanks for any help.