The first thing I'll address is stove location. I saw this under discussion here: http://www.skoolie.net/forums/f13/ou...-no-10520.html
and would like to add my two cents worth.
I have three thoughts regarding that discussion, and they apply to everyone who heats with wood:
First, INSULATE. I'm a big believer in energy efficiency as the best path to comfort. The most important surface to insulate is the roof, followed by the walls and finally the floor. You can't neglect any of these surfaces and still be comfortable.
Even if I was on a very tight budget, I'd still use closed-cell spray foam in the roof. Besides being the best R-value per inch where it matters most, it completely eliminates air infiltration, adds rigidity to the structure and really dampens outside noise. The up-front investment in good insulation will pay lifetime dividends in comfort and fuel savings. (The comfort aspect is year-round, too, so it slashes your air conditioning loads as well...)
Second thought: a centrally located stove is no guarantee of comfort. It should help, but because the bedroom area is rather closed off, plus the fact that it has a ton of outside surface area relative to its interior volume, I suspect that bedroom will still be chilly. Go to the link and look at the revised floor plan if you can't picture what I'm saying - I suspect you'll agree.
Third: it is quite easy to distribute heat evenly with small blowers, except that it doesn't work in the way one might first think: I do not, ever, try to circulate warm air!
Rather, I pull cool air from the furthest reaches (which in the linked thread would be the bedroom) and blow it directly onto or as close to the stove as possible. This causes the warm air mass to "ooze" all the way to the furthest parts of the house or bus, resulting in surprisingly even temps.
I haven't done this in a bus yet, but I know it works. I've been able to achieve very even temps throughout my own homes and also many clients homes using this method. For homes, I use insulated flexible ducting and inline blowers available at Home Depot, Lowes, etc.
For a bus, I'd use the exact same idea but find an efficient 12 volt inline blower, which could run directly off house batteries without running an inverter all night long. Putting the blower in the middle of the run of ducting minimizes blower noise.
Moving air in this way works wonders in keeping the area the stove is in from becoming uncomfortably hot, too. If you do it right, your comfort level should rival that of a well-built home.
In my own plans the wood stove is going right behind the driver's seat. I'll most likely have an attic in my raised roof, so I'll use a run of small diameter (4-5 inch??) flexible ducting up there. It will be inside the insulation envelope, so it doesn't need to be insulated.
If you don't plan on raising the roof, you could always run a duct underneath the bus, in which case I'd use insulated flex duct and protect it from the elements by running it inside some flexible stainless steel chimney liner.
At the very least, one could put a blower in the bedroom wall that pushes cool bedroom air into the "living room" where the stove is. That would draw warm air into the bedroom, and should work pretty well with the centrally located stove in the revised floor plan. You'd probably have some blower noise, but you'd be a lot warmer!
You could always regulate the blower with a thermostat, too.