I'm in the process of getting a layout for my bus (20 ft area). I need to go back and add wall thickness for final object measurements.
I may be overthinking the process, but do you have space allocated for electrical (batteries, breakers, hookup cord, etc), water pressure pump, storage for black/gray dump hoses, fresh/gray/black water tanks? Also, will you be carrying a generator?
Long thought process to make sure that everything happens in the right order and we don't have to rip something out to get something else in place.