Hi It’s a tuff one. To start wrong time of the year to sell. Condition is a big factor. Rust hmm well If i see rust on the body work it would make me think what about the rust I can’t see! Let’s not forget demand, which I don’t think there is much for the Corrado. I own one and love them, but let’s face it parts are nightmare to get. So even tho £4000 maybe good there are a lot of factors that would put people off. I hope this helps some.