Start at the local library and look for books on composite materials and fiberglass construction. There are books on building racecars, boats, and aircraft that have good techniques. Making a fiberglass mold is a lot of work unless you plan to make more than one. If you are good at calculus or sheet metal development drawing, you can do things with honeycomb or sheets of material bonded to foam insulation. My book on composite materials is by Keith Noakes.
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