I've built two tent stoves. Both are the same design. I used old galvanized water tanks.

I used plasma cutter to cut a door out, and to cut the hole for the stove pipe. To control the air flow, I used a uni-bit, and cut six 1" holes in the side near the bottom of the tank, Then I made a slide that opens and closes the holes to dampen the air flow.

I also mad a grate so that the air comes in from the underside of the wood.

It works very well. I have the prototype, and the 2nd model was given to a friend..

If you have access to some scrap material, and a few tools, you can make one of these on your own.... By the way, YES, I burned off the galvanizing so that I did not poison myself. I also painted the 2nd stove with high temp stove paint.

James Pepper: There's no law west of Dodge and no God west of the Pecos. Right, Mr. Chisum? John Chisum: Wrong, Mr. Pepper. Because no matter where people go, sooner or later there's the law. And sooner or later they find God's already been there.