I'm looking at a 2002 Cavalier Z24. The guy is asking half what it's worth because it has a Junk/Salvaged and Rebuilt title. He says the driver's side door was destroyed and replaced but that there was no engine damage. Is this a good idea? It seems like a steal to me. The thing's got 3500 miles on it. What should I look for on the body to determine whether this is a good deal or not?