how bad is bad ?

2 options.
1. part it out. use the money to buy a better resto
2. get a donor car. get a welder. and torches. strip the current one down to nothing. send the inner hull out on a flatbed to a sand blaster. get it back, weld in what it needs. will be a fun project. you can get a decent welder under $500 if you look around. donor car maybe $1000. i dont know how much it would cost to get the unibody / fenders sandblasted. i have heard it's not a good idea on doors because it's hard to get all the sand out of them no matter how much you use compressed air to blow them out. it's better to strip the doors by hand.

anyways, the costs in the end will probably be the same. only difference is that if you do the body work yourself, you will put care into the job and you will know it's done right.