Thanks to sollaryellow and Pops you guys inspired me with your designs so I finally took a shot at building one myself. I definitely learned a lot this first time around, especially what to do differently next time, but all in all I'm quite happy with the results. Looking forward to firing it up for the first time Here are some pics... I used a sheet of birch plywood, expensive but it really looks nice. My wife and I will probably do some cool burn art on the sides at some point. box pretty much done...I drilled my holes in the 2x4s and then ripped them on the table saw. almost done... I put some heavy duty casters on the bottom and one that has a locking lever... inside of the door, I lined the seam with some galvanized HVAC parts to cut done on smoke leaking, can't remember what they were called and drilled them in..I then put some weather stripping on it to give some extra seal between the door and the galvanized steel. I only did this on the large door where most of the smoke will be. The smaller door down below seemed to have a much better fit plus with the heat I didn't want the weather stripping material exposed to it. close up of the door... I lined the bottom 18" or so with Hardibacker... final product - thanks for looking!!