I am looking at modifying my fridge to work better for competitions and to make it easier to transport. Thought this would be easier and cheaper then designing and building my own version of a vault cooker. I will be cutting the door in two pieces and moving the firebox inside the fridge on the bottom. I will be welding in a water pan to seperate the two areas. I was going to do Myron's style where the left and right side are welded to the side walls then front and back has a small gap to allow heat and smoke up to the meat. At the top edge of water pan there are pieces welded at an angle to divert the heat and smoker down to the middle of the water pan so it moves straight up the cabinet. Then I thought about designing my own. I was thinking about making a 4" deep water pan in the shape of the roman numeral #3. The two slits in the middle would be open to the firebox below. Then weld on long roof shapped metal pieces leaving about 1/2"-1" gap between the top edge of the water pan and about 1" up the underside of these angle pieces. I was hoping this would distribute heat and smoke more evenly throughout the cook chamber. Or my other idea was instead of making long rectangle open slits to the firebox below was to make two circles and weld on octagon shaped steel cover to distribute heat in multiple directions. Those of you that are familiar with heat and how it moves could you please chime in. Dont really want to copy another design would rather do something else