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I would cut the floor out, dig all the saturated foam out and rebuild the floor with stringers and new foam, and a new deck. Make the deck and stringers out of closed cell foam such as divinycell, and then fill with liquid foam. There is a 13 footer that has been rebuilt this way. Probably a lot easier than cutting sections of the outside hull out, and rebuilding the outer hull. and doesn`t jeopardize the strength of the hull depending on your skill, putting it back together. There are many threads on rebuilding the transom. If you don`t want to do it sell it to someone who does.