If you get the boat cheap enough and its only the decks that are soft its not hard to cut the decks off put and some foam or 4mm ply bulkheads in. Then turn the old decks over wessystem 8mm davinacell foam, then cloth on. The foam can be ordered with slits so that it curves to the shape of the old deck easily and doesnt pull the deck out of shape. Then make a lip around the cut with foam and cloth sit the deck back on wessystem the deck back on. You can now dance on the boat for hardly any extra weight. Avoid deck ports anywhere near where you might put weight. Ive just done all this including the cheap boat
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