What's with auto body people? . . . .

Not offended by your idea of body guy's,Been doing it for a hobbie for over 28 years now,the problem is that materials and shop time are the best deal for the customer but who can say how long it will actually take to give an accurate estimate?you get started on the job and theres more rust to be repaired before the frame pieces can be put in,the new frame section needs sandblasting and painting theres a lot of unseen work to it,most shops that do give an estimate have to shoot it up to the moon to make sure they don't screw them selves,and to give a customer a good job takes more time than it might seem.that's why a lot of folks here at f.a.b.o. do this work themselves and the paint work and the body work so I guess we all tempermental fume sniffing flakes???.
Body guys are temperamental fume sniffing flakes. Your guys have no manners to boot.

If the car needs a new unibody (no separate frame), do exactly that, find another body. Rust free 72 Scamp/Swinger bodies aren't hard to find. You wouldn't believe what it cost me to get rid of one a couple years ago.

Part of what makes A-bodies so fun is that they are cheap and plentiful. They were cheap cars when new, they made a bajillion of them, and they will never be worth a whole lot. Have fun, but don't spend $10,000 fixing up a $5,000 car.