The fuel tank cover (25" x 63.25") on our 1988 Seville Bow Rider needs to be replaced due to the plywood delaminating along the edges, causing the flooring to sag when you step on it. The aluminum angle bars are in good shape and securely attached to the stringers. The existing cover is comprised of two 1/2" thick plywood boards sandwiched together. I recently added the stainless screws to keep the boards together. For the replacement, I was considering using a single 1/2" thick marine plywood and covering all sides and edges with a few coats of epoxy. Any thoughts on whether the 1/2" epoxy-covered plywood alone will be strong enough not to sag under weight? I also thought about adding a few epoxy-covered plywood strips on top of the fuel tank as support. Any input would be much appreciated!