Someone bought this 69 Firebird convertible and found out the rust was too much to take on; I agree. If a car needs extensive metal work, the cost of repairing it vs. buying a car in better shape sides with the better shape car. In this case, at $8500 BIN in Texas for a 69 4-speed convertible car it doesn't get much cheaper, but the rust is deep.
https://www.ebay.com/itm/20411381317...Bk9SR-CasM73YA