Marine Plywood is a horrible choice for core materials, as I've written about in this post
I would recommend going with Airex, which is a ductile PVC foam. It is probably flexible enough to follow the curvature of the deck without having to resort to slicing kerfs into the material.
If you wanted to go with end-grain balsa, you'd probably want to get something like Baltek ContourKore.
I seriously doubt that anywhere local is going to have either material in stock. You will probably need to mail order it or have someone special order the material.
I would recommend using Progressive Epoxy Polymers products unless you have to work in colder temperatures. For that there is a special purpose cold-temperature curing epoxy made.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.