My father made a barrel stove for his big canvas hunting/camping tent (approx 12x20). AAA Canvas Tents — standard features
He made the stove from a 50 gal barrel. He cut bottom cut out (sits upright on the ground directly - dig out a small breather hole in the ground), a square door cut into it, a larger piece from another barrel to cover the square hole, door hinges and a latch (with wooden handle to keep it cool), and a hole in the top for the 3 inch stove pipe running out of the tent. He has used that tent and stove on 2-3 camping/hunting trips a year (3-7 days per trip) for the last 28 or so years and both still function great. The stove has burned cedar, aspen, pine, and more and has not burned through.
If I could find some smaller steel barrels (5-20 gal) for cheap it would be fun to make a stove or two following a similar pattern. Then again. for many river trips I'd need a different stove, one where the fire didn't burn directly on the ground.