Thanks Ed.
My next step is to determine whether I need to keep the core at 1.5" deep. Only thing I can think of is that it was made that the hatch was made that deep to rest on the "retaining walls" for the gas tanks, giving the deck added support. Going to measure this out and see what I find.
If there is no need to have it this thick, I think a 3/4'' core is all I need to reinforce this properly. If I go with Nida Core, I will use marine ply as my backing material.
Where do you pick up Nida Core? Does it have to be special ordered though a vendor or is this something they will stock at a lumberyard? I remember my last run at one of these my closest spot for marine plywood was Hingham Lumberyard in Hingham, MA.
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