My brother in law fell into this 2 years ago. 1965 2+2 Mustang that had been stored for 40 years. I looked at it after. Didn't look good. He called another body guy to come look at it. This guy does it at home because he likes to. Hauled the car out the next day. After 1 year of removing all the sheet metal screws, rivits and bondo he had to replace almost every body part except the firewall, roof and floors. The guy did all body work, repaint interior, replace interior, replace engine and trans, converted front to disc, vintage air, led lights. etc. Cost was another $15000 labor.