IMO he should have put a reserve price on the car with a much lower opening bid. If I found one for 9-11.5 I would sure be interested. His terms do suck though. I would be there in the three days to looks at it and then give him his check if it is as described
Things not working, needing replaced and needing metal work I would say around 10,000-11,000 tops. At least some of the mods are reasonable desirable ones to some people, but they don't help the value any.