Im looking at a 1977 18' tahiti jet boat with a brand new 460 with orginal berkley pump and all new interior. the owner is looking to trade for my cbr 1000. Owner has told me stright up that the hull has stress fractures and from the looks of things it is only on the top of the boat. how important are these to get fixed right away and what kind of a price would it take for someone to fix something like this? and what would a boat like this go for in todays market?