I picked up a Hartford "Hobart Estates" logging caboose from Pete Doty and thought the pics might be of interest. Ozark, which now owns the Hartford line, have the kit on their website but I don't think they have re-released it yet. Our own Bruce C. did a version of it back in 2008 - here's his build:
It came with a working stove! Well, maybe it smokes, but I hope it doesn't produce any heat.