Hopefully those added layers of lamination plus the fact that I used marine epoxy to glue the plywood to the polycarbonate will ensure that the center fin will not come apart when stressed

The side stabilizer fins are constructed of two plywood layers laminated directly together, no polycarbonate layer sandwiched in between, since they do not need to flex.
Question: Why is it impossible to starve at the beach or desert?
Answer: Because you can eat all the sand which is there! (…sandwiches there)
