VanPlot: Build the van twice

Field notes

The planner models specific van geometry rather than treating the vehicle as a rectangular room: the page names sliding and rear doors, wheel arches, wall taper, and multiple drive and body variants. Placed furniture is said to affect payload, axle split, centre of mass, budget, and electrical sizing. The advertised Build Sheet extends the workflow into construction, with stud-by-stud cuts, material quantities, power requirements, and a PNG export.