I have a friend who does restorations. He charges by the week so I'm not sure he can give you that accurate of an estimate, especially when it comes to rust. Is you car disassembled? What year Coronet is it? Are you wanting the body work done only or paint too? Does your can need panel replacement or just repairs on existing sheetmetal?

Let me know and I''ll ask him if he would be interested, although I'm not sure he can get to it in your timeframe. He is a busy man, small shop, and does quality work.