Need a super redesign

[IWC Bus]

Good morning everyone,
Well my wife and I lost what little of brains we had left and are about to start all over on 2 different planes. The 1st is we have adopted 2 little boys age 4 & 3. We had them since birth so I couldn't see abandoned them at this point of their lives. However we are still foster parents to their 2.5 year old sister.
Who we had since birth also. After my wife rising her 4 and I my 4 children. I thought I was set to retire so, sell the brick / mortar and hit the road.
So here we go - number 2, my Bus's current design didn't included bunk beds or anything. Now I must rip the bus apart to accommodate my new additions.
Any ideas for a 35' interior that must include my King bed, a bunk room for 3, shower for a 6' 4" handicap, and toilet for the same. Just think that just the back to almost the front.

[Willie_McCoy]

We are a family of 5 plus a beagle, I'm currently building a 35' interior that has a master bedroom big enough for a king (although we are using a queen) at the rear, then 4 bunkbeds, 2 on each side flanking the center hall, a small 24"x27" shower and a 24" x 48" toilet room on either side in front of the bunks, then a full-ish kitchen with apt size fridge and gas range on the drivers side, as well as a small dinette on the passenger side with couch seating for at least 6, maybe 8 people filling the rest of the space up to the front on both sides.

I toyed with different options for the bunkbeds such as placing the shower/bathroom between the bunks and our room for "privacy" but it didn't work with the rear wheel arches. What I have now is the only way it would fit in our case.

It is an extremely tight fit, 2x3 & 2x2 walls to save a few inches, 1/4" paneling when needed, or 1/2 shiplap for wall covering. I know I couldn't fit a bigger shower or toilet area without loosing seating up front, but with more ceiling height im sure a 6'4" person would be able to use my layout.

I am not planning to live in the bus for more than 6-8 weeks at a time so dealing with cramped shower and toilet rooms is ok as I expect we will have access to fixed facilities most of the time.