I was under the impression the OP wanted a rear deck and spare tub. Yes, the floors are rusted but the deck looks decent. (could ask for more pic's)

I personally have seen tubs for sale but never a whole rear deck. A complete parts car maybe, then it shouldn't necessarily be cut up.

I'd use this deck to fix the car, and sell off the quarters and anything else. ?‍♂️ I guess that's just me. 

there are a few wheel wells on ebay, i may pickup that and just sheet metal the rest of the trunk deck.