The plywood squares that came out measured just over 3/4". Of course they had grown some due to absorbing water. The fiberglass mat would only be over the center of the fuel tank hatch. There is a 1 1/2" lip around outside edge that does not have wood core. Seems to be plenty of room between tank and bottom of hatch. I am curious as to which would be stronger - cutting plywood into 10" squares as Wellcraft did and using more resin or leaving plywood as a single piece ?? Right now I am leaning towards one single piece of plywood. Have not got fish box lid apart yet so do not know for sure about plywood thickness that is in there. About the only thing holding fish box lid together is the hinge screws.
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