The coffee can idea is a good one. You just need something to hold your pot 1-1/2"-2" above the top edge for the convection currents to be able to accelerate properly.
I make them out of Stainless steel, 100% fiddle free- extremely durable, the one below is 2.8 oz as shown.
Designed to fit a wide range of pots. (tall/skinny or short/wide) The larger the pot, the larger the firebox/stove. These stoves are designed to be lit from the top, thereby eliminating almost all smoke. I just used this very stove for a week long snow hike in the smokies as my primary cooking stove and rivaled the canisters at some meals due to the very cold weather. I was well pleased. I used my old Zelph Superstove for a few coffee brew ups but burned wood for all of my meals.