Awesome experience. You should pick up a scooter while you're out there. PGO's a great brand, and they're sold over here as Genuine Buddy Company, so you'd be able to get parts and service in the States.
Let us know more about the LP hot water on demand unit! I know they are the standard way to heat water in Europe and Asian countries. What's the energy consumption for those units (LP/gallon of water or rise of degree)?
Hope your time out there is rewarding and fun. Get back soon, though. Can't wait to see what your bus looks like when it's done.