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Aluminum honecomb panels come in a variety of sizes and dimensions. A sheet of 3/8" x 24" x 48" lists for $162 USD at McMaster-Carr.
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Sounds like I got $80 worth of free materials
always a good thing.
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I suggest reinforcing the joints at the rear bulkhead by the seat with vertical pieces of 1" aluminum angle stock bonded with epoxy for stiffness.
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I already layed up a layer of 1.5oz fiberglass mat into those corners. I think they are ok, but we'll see. interestingly I hot glued in cardboard to mock up the wheel well, and that made a huge difference in stiffness. it seems that closing it in the rest of the way was the key.