more cross breeding, need advice

[68C15]

in case anyone remembers Lefty is in a state if limbo right now. I started to tear him apart about 4 months ago. I actually got it down to a rolling chassis. but now he is being put back in service. (darned friends needing help moving) the problem I have is the original wood floor was totally trash. so upon disassembly the wood was thrown out. now I have to put some kind of floor in it. since I have been thinking of a steel floor since I bought Lefty I picked up a SOLID steel floor from a '79 long fleet. will this fit my '68? what do I need to cut/weld/reshape? keep in mind my budget leaves just enough room for either beer or parts. its rather warm here so gues what gets priority.