Just look at the two pictures in this thread the deck does not sit on the center stringer. Your old tank deck was sagging in the middle because it was old and not laminated on the underside. Cut you wood with a bevel and glass it in place resting on the V of your hull design and snug it close to the stringers. This is not rocket science the tank itself has lots of its own support working for you.
FellowShip
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My motto: Just for the Grins
