pictures are deceiving, not sure how much space is behind that thing...i'd shoot for at least 18 inches between it and the wall...my stove is a different set up, but i know with a bigger blower, the heat output literally quadrupled. so, if you can get some kind of a fan/blower to move air ACROSS that thing, not THROUGH it, you will be light years ahead of the game. if the fire is going out when you shut the door, there is a flue somewhere in the chimney, if its not within a few feet of the stove, thats probably not the problem. there may be a cap or obstruction on/in the chimney as well. if the stove isn't smoking up your house, neither of these is likely the problem. (think engine here; air goes in at the door or carb. burns in the stove or cylinder, exits through the chimney or exhaust.)
there is probably some kind of "valve" on the doors, usually a big metal knob on a screw that you can turn out to open it, this is called a damper, and it basically acts as the throttle butterfly. open it, and fire should burn.
official pit chef for Will Carter #52x.
yeah, i cook...