Working on the camper layout a bit before work.
Light/dark brown is dimensional lumber (2x2 and 2x4), orange is plumbing/electrical, red is 2x2 square tube, green is 1.5x1.5 square tube, yellow is 1 inch angle iron, beige is 1/4" plywood. The transparent "holes" represent drawer dimensions.
Goals:
Sleeps 2
Kitchenette w/ sink, fridge/freezer
Shower
Composting toilet, no black water
600Ah of battery
Shore power connection
DC charging from alternator
Aircon unit
Diesel heater
Rigid pop top (better fuel efficiency, clearance, and handling while in transit)
Heavily insulated (1.5" XPS on walls, 2" XPS on floor and ceiling)
On-frame truck conversion
I think I've managed to cram all of that in a 10.5' by 6.5' floorplan. I just ordered the structural steel so I may get to start on this next week!
This is going on the frame of a 2007 GMC Sierra 2500HD with the 6.6 Duramax diesel engine, and we should be about 700lbs under GVWR with water, fuel, and us plus the dog.