That's pretty cool so I thought i would try to build a RF knockoff twiggy... I dug around and looks like I have most of the stuff needed to give this a shot.. found a pc of pipe that will be the cook chamber it is 9in ID and about 26in long. the firebox is 9.5x10x10..lol and that is still a little big using the calculator I wonder if you have to feed this little smoky propane to get up to the 500 degree mark, or if it will get up there with some lump? not sure if I want to make it look like a mini trailer rig, or fix it to mount in the receiver hitch and a small stand for storing it. any input on what might sell better? well here is all I got done tonight it is just to darn hot outside... just the fire box and pipe cut to get a idea of the size.