Back to the drawing board and this is what I come up with: 12" wide x 36" long, give or take a few depending on brick size. A 6" square fuel feed, 4" square burner, 4" inside a 6" raiser (both round) with a 8" square (inside) brick bell then a 4" round stovepipe exhaust inside a brick chimney. Two sides could have a 7' brick wall on them the width of one brick.
Now the questions. Would this work? How much heat do you think it would hold/give off and for how long? How long should the burner be (center of feed to center of raiser)? How high should the bell be (it will have a metal top)? And last should the stovepipe have sand between it and the brick?
I live in Alaska and our winters have been getting warmer as the years go by but we could have -20* F at times. Would like to keep the place 65-70* F. and not have to keep putting wood in every 30 minutes.