Go through my build thread if you want to see some areas of rust rot. It will show you a lot of the main areas to look at where rust occurs. I had to repair 3 frame rails, the rear crossmember, trunk pan, inner quarter panels, the upper control arm mount tabs and the frame that they attached to, torsion bar crossmember was rotted and I reinforced that, where the torque boxes (not sure if I'm calling it the right thing) attach to the rear frame was rotted, and a whole lot more beyond that even. It seemed never ending with the rust repair. The only thing that saved my arse was repairing it all myself so I only had the cost of the materials. When I bought the car, it was cosmetically in good condition. But it turned out to be a structural rust nightmare.
