I see a lot of fiberglass in the boat business- from battery boxes to dock boxes. It is usually really strong. We stand on them and are constantly stepping on them in engine rooms. Why not use the plywood, build a plug and just make cages out of the fiberglass and pop it out of the mold? Is that a lot more expensive than working with plastic? I have seen a lot of things fabricated on the spot and thought many times- man, that dude could make some killer cages!

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