I think Vikki has said most of it, but to my untrained eye, things do not look good. I have a similar car, with less rust and I already have close to 25K into mine.
You are going to need quarters, fenders and most likely doors from the pictures alone. Unless it is a numbers matching, I would be weary about sinking the kind of cash necessary to make it right.
My $0.02
68' Firebird 400 convertible, numbers matching, solar red w/ deluxe parchment interior. 66' Pontiac Ventura Hardtop 66' Pontiac Catalina Convertible