Great build, especially given your lack of hands on experience, it truly shows what a “can do” spirit brings to the table.
I grew up doing fiberglass work in the body shop industry and spent some time later in life working for a boatbuilder in the Portland area that specializes in wood composite construction. Lots of solid advise so far, I would add that taping the inside fillets is critical. Also, try using a product called “peel ply”. As epoxy cures it out gasses wax, if the wax isn’t completely removed by sanding and/or chemicals you lose adhesion. Peel ply is applied onto wet epoxy and pulls the wax residue off when removed after cure eliminating the need for most of the sanding. It also can be used to help shape nice, long, consistent fillets for appearance sake. You will still need to do some touch up sanding but the peel ply will eliminate most of it. You can epoxy directly on top of the surface after you remove the peel ply, it’s available most places that stock epoxy products.
I just wish I had read your thread sooner
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