Mine was ground down to a bare fiberglass top... no wood left. And then rebuilt out of 1 1/2” foam laminated with epoxy. I then skinned the bottom with thin door skin plywood. I wanted it to be as light as possible and super well insulated. I would have skipped the door skin if I had had known how I was going to finish it. Ended up with the vinyl headliner but I was considering some type of laminate at the time....
I was VERY careful with maintaining the position of all of the mounting points for the scissor mechanism so I did not have to trial and error to get it to center on closing!
Best of luck! I would avoid putting any extra holes in the top... less chance of leaking. If you are going to laminate plywood directly make sure you ground the inside surface well. You can use polyester , vinyl ester or epoxy resins
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