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Kevin, my cap project is on hold at early stages of work so what I can share is limited. Sketchup was great for 3D visualization of the concept. I also started using it for virtual build. To check 3D angles I started the base frame. My cab match was empirical using a template. See attached pix. (Sorry for small size; the forum imposes a 127KB limit - shrug.)
These were my next steps. Start with three side-to-side bulkheads. Front and rear being permanent. Middle temporary for construction. Rip strips of thin plywood like lath for a series of front-to-rear arches to define form. They would be flush with the bulkheads. Rip strips of thin poly foam and wrap from one side the the other. Start in the front and work towards rear. Trim as go to achieve orange peel effect. Tape joints with duct or gorilla. Leave excess overhang at both ends. Fiberglass the outside first to capture shell form. After hardened remove middle bulkhead and lath strips from inside. Then evaluate strength. If desired, add more fiberglass. Perhaps glass whole inside too; definitely reinforce joints. Once satisfied with shell itself, separate lid from base and work out details: seals, front hinge, lift struts, latch mechanisms, paint, windows, etc. Hope that helps some.
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