It'll likely be next year when the walls get finished, but they will get finished. My wife's already picking out the colors for upstairs.
After we wire it and save enough money to continue, we'll have the sprayed foam insulation put in the walls downstairs and sheetrock those walls. I'll probably use recycled loose fill insulation {like the stuff that gets blown in with the machines you can borrow from the Big Box home improvement stores} for the ceiling/floor area between upstairs and downstairs. I am still working out how to insulate the upstairs walls. Whatever we come up with, it has to be pretty well insulated, as we're going to heat and cool it by solar power.
The barn will be off grid if AEC doesn't allow me to grid-tie my solar array. I'd run it guerrilla style for a while, but my wife was displeased with my cheating and I had to turn it off. We're still at odds with them, and I'll continue going to the meetings and trying to convince them to join the 21st century.