Again fabulous Rig. Looking forward to top install and interior.
FWIW here's some pics of our Limo Bus interior. A lot of thought was put into the simple layout to maximize creature comforts, at the expense of larger cabinets, kitchen and bath.
It's set up so both wife and I have our own jack-knife sofa beds. These are top of the line units, no sagging, best foam and leather available, very comfortable.
It's been our experience with previous small RVs, they had to many cabinets, booth sofa/bed etc, never had a comfortable place to sit and relax or even sleep.
In our present Rig when we pull over to relax, nap or hang out, just flop on our own sofa. At night I open my sofa bed while wife sleeps with her's up. They can be folded out together to make a strong, almost king size bed. All in all we are very pleased with them. I'm sure you'll design an excellent interior for your Rig however it's laid out.
Other items to consider that work well for us.
120 volt electric 5 gallon under sink water heater, turn on max for a good 8 gallons of very hot water. Insulated tank, water stays hot all day.
12 volt electric waste water dump valve.
Espar diesel furnace
Semi-truck sleeper cab split-unit air conditioner.
Fantastic roof fan, set to vent out and have two small 4" inlets at bed height to create a very effective cooling breeze.