A custom lightweight insulated hard-sided truck camper for mid-size and half-tons. Decided against fiberglass since it can be a pain in the butt, especially with no garage and in the cold. Ideal would be no wood and minimal framing, but i'm not a mechanical engineer, so it's hard to calculate the forces involved, so over-building feels necessary. If anyone is a mechnical engineer, and bored, and would like to contribute their skills, I really want to open source the result so anyone can build it, using basic parts you can find at the big box store. So far I have a crappy model in FreeCAD and a lot of research material.
Mind sharing the resource material? I've looked into this briefly, seems like a common-ish path for flat bed trucks is using a surplus S-280 (e.g. https://www.ramims.com/products/S-280C-G).
