@CP, is there a build for the bus some where?
Or even some info on what it has and floor plan, not wanting to distract you from 'nest build so if the answer is no that's okay (I'll bug you about it later).
Curious to see what you do for interior walls and electrical / plumbing.
I'm considering a 'tank less' bathroom in my enclosed trailer (8.5' wide, 17' long V-nose)
It will sacrifice one ATV space, currently it hauls 4 ATVs.
Shower and a porta potty, shower only works with full hook up.
Maybe a 'point of use' electric hot water heater - but I'm looking at your water heater also.
Original thought was no pump.
Thinking about it, a 12v pump and a stream and it could be usable.
I think the most likly use will be stay in a hotel while hoofing it across the country then stay at a camp ground.
With a pump and some water cans we could camp remote for a day or two.
Lots of good ideas, thanks for posting in detail.