Now that I have a little more room and better access to the floor and substructure, I was able to complete some more accurate renderings of what my plans are for the interior. These are based on removal of the subfloor generator (replaced with batteries) and subsequent flattening of the hump under which the genset currently resides.
The driver's seat is in front of the refrigerator, with about 12-16 inches between the two. You may notice there is no passenger seat area. That's where the dogs will live.
Driver's side interior. The curved-door shower will work in that location, but cost may dictate something a little less extravagant. The kitchen area is just aft of the fridge.
Passenger side interior. The ladder on the ceiling tilts down for access to the hatch and planned roof deck. The computer workstation is next to the entrance door.
Overhead plan. The toilet shown is a placeholder for a cassette toilet with exterior door access to the cassette. The rectangle in the middle of the room is the roof hatch location.