Well, I'm currently in the middle of a complete ripout and replace of our companionway bulkheads and engine enclosure due to rot caused by the previous owner's lack of concern that his cheesy homemade drop boards leaked like a sieve whenever it rained. Since the first step was to stop the leak, I made new drop boards with 1/2 inch tinted polycarbonate and Starboard, using overlapping joints. I've attached some pictures which show the boards finished on my workbench, a closeup of one of the overlapping joints I made, and the new boards installed on my boat. You can spray a hose at the boards now, and nothing gets through.
And forgive me for saying this, but I don't think you can fault Hunter for their choice of materials when the problem seems to be an ignored leak. There are a lot of things inside the boat that will last a long long time as long as they're kept dry, but which will fall apart if you let them contantly get wet. Just saying.