Car is not in bad nick as most were considering the age it has on it. Make sure you do proper work, Undercarrige paint and seals should be done. Painters only paint exterior while the side where interior was dented remains un treated which leads to early rust. The rear tire fender you did, apply under carrige paint inside too. While doing interior make sure all fitings are proper and foams and sheets for doors stay good otherwise eliminating noise from car would be impossible
best of luck, some suggestions that i gave is what i can help..........