If you have laid all of the glass outer layer just in 1/16" weave glass, you may want to add a layer of 3/16" weave glass mat (sometimes called "Woven Roving") on the back side. Most times you will need to visit a marine supply shop to find.
You can also add bracing in the critical areas in the glass and resin on the backside, made from 1/4" or 3/8" marine-grade plywood. once encapsulated in the resin, it will be very strong.
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