I think you're incredibly light on your prices. For instance, I saw one vertical fin for 300, but she looked a little crusty. Most are around 450. But that doesn't include shipping or labor to remove and replace or paint to make it match, not that it really matters. Whats shop time to replace the fin?You got that right. And that’s the big difference between me and you. You spout opinion, pass it as gospel with zero reference, then walk away. Just like the reason for my first post on PoA. Your typical “I’m right, you’re wrong, screw the customer mentality.” At least you’re consistent.
Me, I prefer to help the OP if they ask.
For example, you looked at the OPs 4 pictures saw some corrosion and some missing metal, declared it junk and you were done. Then pivoting, you state the OPs PA-28 needs to be restored like your Cessna 170 where you replaced 29 skins… which I’m still trying to figure out where those 29 skins are on a fabric 170. But I digress.
Whereas I looked at the same OPs 4 pictures you did and determined the vert fin could be replaced for $300, bulkhead at $400, the “missing” channels and angles could be bought for around $500, and in a worst case scenario the lower skins could be had for around $500. Same pictures, different results: $1700 parts vs junk yard. And for what its worth, this is the same method I use whether a Piper, Cessna, Bell, Stearman, whatever aircraft and has never failed me yet.
HOWEVER, only until the OP gets the aircraft properly evaluated and a repair estimate will we really know the extent of the damage. But then again you’ve made your mind up its junk and even if the OP does have it repaired and continues to fly you’ll step right up and state… “Yep, he did just like I told him to do…..”
I'm absolutely 100% for saving as many old birds as possible. But I don't think we're talking 1500. I definitely think it's worth getting an opinion on if it could be repaired vs a fuselage replacement. As bad as those few pictures looked, it was like they gave it a bath with chloride while they were plowing Quogue.
If it were me.
1) get a second opinion. Particularly a shop that has done this work before.
2) Call pre-buy AP. He's probably the least culpable depending on what he was contracted to do. Find out how it was missed and why. Maybe give him a some insight on where to look next time. If I did the pre buy I'd be giving your money back.
3) call the previous owner or owners. Feel him out. After all, he sold you a lemon. Does he get evasive? That would tell me he knew. We already know the owner A/P had to have known and either didn't care or was trying to make a buck. It's interesting the engine seems ok however.
3) call previous IA's. See why/how this was missed.
4) Contact your FSDO. They're probably going to want to see the airplane and figure out why so many missed this.
5) depending on the answers above, get an attorney. If you get the sense they knew and were deceptive, you might get a judgement. Doesn't necessarily mean you'll see anything. And may cost more depending on what lawyers get.