I just went through the same project my old caribeen crest cutter 1974 came back from a day out and water just poured out. I decided that the hull needed to be fiberglass went to a shipwright and he looked at the boat walked on the floor and showed how it flexed and looked at the transom and said whoever put the motor on 5 yrs. ago should not have done it as the transom was spongy. The cost would be around $30,000 it would be better to buy a good second hand and start again. He helped with choosing and inspecting the boat. It turned out to be a 1989 Caribeen Crest Cutter in terrific condition we changed over my ETEC and trailer and I could not be happier like the others said I would walk away. The total cost for the new boat was $11,500 the changeover of the motor and trailer $1,500 and checking electrics so got out of it for half the cost. He charged $250 for the inspection best money I have ever spent