If you build a fold down cover for the step well you can mount a co-pilot's seat just aft of the step well. If you mount it on a swivel you can turn it around to use while the bus is not moving.
When my wife and I first got married she didn't understand why my brother always would open the french doors during the winter time. It wasn't until we started to heat our home with wood that she realized the opened doors were the thermostat.
You may want to install some computer fans to move air around the bus. They are small, quiet, and use very little juice. The fans will help to move the air around helping to heat to heat more efficiently or the A/C to cool more efficiently.
At the end of the day, your bus is a relatively small space. If the stove isn't sized correctly you are going to have a hard time regulating the stove to put out just the right amount of heat. If it is too large it will be very difficult to not over heat your space. If it isn't large enough it will be very difficult to keep the fire stoked up enough to warm the whole space up.
Curtains would be the easiest. Pocket doors would elimnate swinging doors. Accordian doors would work as well. Accordian doors are what came from the factory in my Avion travel trailer to seperate the bedroom and the living room from the kitchen. When not in use they fold back unobtrusively. When in use they effectively close off areas of the trailer. A space was left at the top to allow cold A/C air to flow into the closed off portions of the trailer.