Given there are a lot of repairs needed, how much would a new prop and steering cable run in addition to the 1500+/- for the fiber glass? I think someone looking for a budget boat would be able to get this thing up and running for around 13,000 if they would take 10,000 for it.
Deal with the upholstery and not having a radio for a season and upgrade that in the off season and you could still be under 18K with a good boat. Assuming there are no mechanical issues. Were you able to crank it up?