Advice needed...should i or shouldnt i...

Not that this should kill the deal, but just a thought, some of the Year One sheet metal required a good amount of work to get a good fit, as opposed to the newer AMD/Goodmark stuff.
I suppose it we're only talking floor pans, no biggie. The quarter panels are night and day difference. Without pics it's hard to tell, but if the car is that rough, it would be a safe bet it needs quarters too. If you are doing a lot yourself that's one thing, if you are going to pay someone else to do all the metal work, you are gonna be in for big bucks if this car "needs a ton of work".