[flyingfrizzle]

You may cause hard spots if you add more bulk heads under the deck, the hull needs to flex. I would consider adding some additional glass strips Down the sides of the stringers to the hull bottom. Use 6" or 8" pieces and split the distance half on the stringer and half on the hull bottom. The hull I had, split like his did, it tore the stringer loose from the bottom of the hull. When it did it ripped threw the bottom. A lot of load gets transferred to the hull there. You may even want to add fillets in a radius in the corners then add the strips so it will spread the load.