I built a "square drop" camper trailer out of plywood on an existing metal trailer frame at Protospace. It took eight work days to build over a three-week period in August 2025.
The camper is approximately 6' wide, 8' long, and 4' high above the trailer frame. The cabin is 6' x 6' and has an RV door (from Amazon), a roof vent, a small vent fan, and a phone charger. The back hatch galley is 2' deep and has some cabinets, a counter top, a sink that drains below to a bucket, and a slide-out tray for my cooler.
The walls are 5/8" plywood on a 2x2" stud frame that sits on a 3/4" plywood base. It was built on an existing flat deck trailer frame that my friend Robb gave me.
The vertices are fibreglassed (would not do fibreglass again) and the exterior is painted with green porch paint that gives it a thick, rough texture. The hatch has weather stripping, the door has butyl, and the roof vent has lap sealant. The hatch also doubles as an awning that I can sit under while it rains.
The electronics are powered by a 40 Ah lithium iron phosphate battery that I manually charge before the trip. I plan to add a small solar panel next summer. The cabin and galley are lit by separate warm high-density LED strips on dimmers. They were positioned to be as diffuse as possible.
I took the trailer on a camping trip at the end of August and it ended up being too cold. It definitely needs insulation. My plan is to insulate the frame with XPS foam and cover it with veneer. If that's not enough I'll install a small diesel heater.
Here's the inside of the cabin:
Here's the galley, in use, at night:
