Most people will tell you that you need to be very cautious about adding a hardtop to a boat that did not have one. It depends upon the design, full like mine or something simple like typical sun covers for fishing boats. The concern is stability with the hardtop changing the CG on the boat. So, I guess it depends upon what and how you build it. As you can see in my profile pick, my boat came from the factory with a tall hardtop. I have dismantled it and am in the process of restoring it including replacing all of the plywood. Mine uses thick fiberglass skin and both sections are very, very heavy but then the boat was designed to be stable with it.
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