The way that the boats are built is that the inner hull liner (deck, seats, etc) are all molded over a male mold. The plywood (most likely--could be balsa or even less likely foam) has become wet because of holes in the floor which were not properly sealed. The liner and deck were attatched to the boat at the hull to deck joint under the rub rail. taking that apart is a large job, but so is cutting out the floor, and then rebuilding the bottom or even just replacing the plywood, and then reglassing the liner in where you cut it out. Not really expensive, if you do it, but paying someone $85 an hour to do it, could easily cost as much as the boat is worth.
I agree, that you are best doing it dIY--but it is a lot of work, so be prepared.
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Bob Austin
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