Cabover camper framing 3
The front wall is covered with interior plywood paneling prior to trimming around the edges and opening with a router or sabre saw.
The side walls are fastened into the longitudinal 2" x 2" cleats on the outer extremity of the side wings. Note the clamps holding the walls in position.
At this point, all interior paneling is installed, framing complete and ready for interior cabinetry, plumbing and electrical. The exterior aluminum will be applied after the interior is essentially complete to allow access to the walls for cutting vent openings and electical.