This, and why isn't there any fiberglass construction? Since most of the build isn't structural, you could use cheap insulation foam for the core (with epoxy re

This, and why isn't there any fiberglass construction? Since most of the build isn't structural, you could use cheap insulation foam for the core (with epoxy resin, not polyester). Fiberglass is quite easy to DIY and requires almost no tools, and no power tools. Most parts can be shipped in normal sized boxes, aside from the fabric. Whereas long tubes of 8020 need to be shipped via special handling. The fabric can be obtained locally from many hardware stores.