Sounds like a good plan. I have done lots of similar work with West Systems epoxy and glass. You are going to need to do something to rough up the surface at the corner jounts since you will have already glassed the inside of the individual plywood sheets. Peel ply is supposed to be an easier way to go but I always just go at it with an auto body disk sander to knock off the shine. The corners need to be extra strong. All that weight will try to bulge out the sides and convert any cube to a sphere.
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