Moving along.
I'm working on the full height cabinets. They are the major components of the interior.
Since there are no straight walls or ceilings, and the van isn't perfectly level, the only baseline I can rely on is the flat floor.
So I built a 6' long square out of scrap plywood that I can use to get measurements.
By clamping my framing square to it at 90 degrees I can get a free standing square.
The first cabinet I made was for the fridge and toaster oven.
Under the fridge will be one drawer and under that part of the water tank.
I cut this piece of chip board close to the right curve and then screwed a scrap of plywood to the exact curve to get a template for the cabinet gables.
In the interest of saving interior space I sacrificed an inch or so of insulation to get the fridge into the wall cavity for the top several inches.
I still need to cut out the notch for the water tank and to cut in holes to allow for air circulation around the fridge.
The wall curves in about 6" from bottom to top.
I have the toilet/shower cabinet mocked up to give myself and my wife a sense of the space.
It sure gets small in there fast when you start adding cabinets.