My first bus was a '51 GMC - 7 windows (never knew the actual length). My husband, son & I lived in it. It was SMALL. It held a twin bed/couch directly behind the drivers seat and directly behind that was a 24" cook stove/heater with a small cabinet built over the wheel well. A full size bed side to side completed the whole length of the bus. On the passenger side we had a short cabinet, the length of a bed and next to that going back was one of the smallest sinks (I think it's called a bar sink) I've ever used for a kitchen sink with wheel well size shelves from floor to ceiling for storage of food & clothes next to it, then the above mentioned bed.
We had a porta potty (never used) that we stored under the back bed, we would have had to take out the back door and carry around to the front door and put in the tiny walkway either in the living space or the kitchen/bedroom combo in order to use, or just plop it down by the back door and enjoy the fresh air while doing our business. Either way, it would have to get put back immediately after using. Hence, a big bush was so much easier.
There was no room for table & chairs or a shower (those were reserved for free campgrounds, lakes, creeks & a good, heavy rain). Actually was showering outside when hurricane David went thru Florida, picking up our soap bucket and carrying it off. (That's when we went inside).
Long story short...7 windows to us was a place to sleep. Spending the rest of the day outside.
As for propane stove, looking at the directions to build a cabinet for it I think turned Hubby off and as said I enjoy my induction burner and convection oven to ever go back to propane.