I built an ice fishing shack that fits on the back of a truck and could be used as a camper, and I think it looks pretty good. It's just stained plywood on the outside with 1.5" rigid insulation on the inside, a wood stove, fold down table and fold down queen size bed. Also has a solar panel with a deep cycle battery to power the lights/fan/sonar/underwater camera/etc. Someday I might put a metal roof on it.
It sits pretty high above the cab of the truck and even though it weighs less than 1/6 of what my truck camper weighs I burn as much gas hauling this ice shack around as the truck camper.
We spent 6 weekends on the ice last season in temps down to -28 and were toasty warm with the wood stove going. FYI, the Canawick brand fire blocks (
http://canawick.com/en/produits.php?cat=Blocks&c=38) burn for about 8 hours when the stove is dampened down all the way. Creosote built up pretty quick though but much better than splitting wood and stoking the stove every 3-4 hours