Looks great! Nice use of an old tank. It would burn wood more efficiently with a baffle about 25mm below the top, welded closed at the back (stove pipe end), and open towards the door, with a space of about 25~50mm back from the door. That would give room to clean it out if needed. I see you already have a baffle in place, so in place of cutting it out, drill a couple of holes in it to run a brush in for clean out.
I have a wee tent stove form the Four Dog Stove Company, their smallest one, and it will drive us out of the five meter diameter yurt at 0 degrees F. Your nice wee stove looks like it would put out much more heat than mine. You might have a look at the Four Dog Stove Company web site for ideas....you certainly have the skill to build stoves.
Woody