I'm looking at a Westsail 43 boat built from a Kit. The boats details are attached.  The original owner purchased the haul, engine, and mast in 1978 and sat on it for thirty years without doing anything.  The current owner, a professional in the boat industry, purchased the boat and did all the finishing work in 2010.  The owner had access to a boat repair yard and used its workers and materials to finish the boat.  The owner is selling the boat as a 2010 Westsail 43.
I've done some research on pricing of Westsail's 42-43 currently on the market.  My research is attached.  The average asking price for these 1974-1985 factory finished boats is $62,500 and I suspect, based on a 28% discount the sale price will average about $45,000.
My concern is that if I pay the owner his asking price less discount on a 2010 boat, which is almost double the asking price found in my research on the older factory finish boats, I will be treated very unkindly by the market in say five years when I sell the boat.  I'm concerned the market will take the position that it's not a 2010 boat but a 1978 boat and a Kit boat at that.
Do you have any suggestions on how I should view this boat and how the market will view it when it's time to sell?
Thanks,
Mark