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Definitely going to keep the plywood camper for myself - knew when I started that this would be somewhat of a prototype. Basically, I'm doing research on all of the possible construction methods and costs on a small scale - I've had some interest in whether or not I'd sell these and I don't know if there'd be a market for them, what a fair price would be, or if it'd even be profitable?
Making the forms for thermo-forming or the molds for fiberglass if you decided to go that way will be a significant expense. In my experience, molds for fiberglass can be less expensive than forms for thermo-forming, but there are lots of factors that determine the cost of forms/molds, so that's not always true, but in general, fiberglass is less expensive to produce in small quantities than thermo-forming, especially at the size of camper components. If you can make the mold masters yourself, fiberglass molds will be a lot less expensive than thermo-forming forms.
Also the "draw" possible with thermo-formed parts will factor into the design of the components; since the parts can't be very deep, you may end up with more parts than with a fiberglass design, where much greater depth is possible. Something that can be made in two parts in fiberglass, for example (think Scamp camper trailer), would require many more parts if thermo-formed.
Structural reinforcement can be built into fiberglass parts, but often has to be done separately when using thermo-formed parts, so that can add to the expense of thermo-formed parts vs. fiberglass.
I'm not trying to convince you to use fiberglass, just pointing out some of the considerations for thermo-formed parts vs. fiberglass parts.
Either way, the tooling costs for a limited-run product of this size will be fairly large. Careful design for the capabilities of the production technique chosen can keep costs down.