I would really consider a unit such as a Spicewine, the insulation and efficiency cannot be beat. Using Binchotan, even in Japan will not be cheap, a UDS runs through 10-12 pounds of charcoal for a typical cook. They are not insulated and during cold weather, will burn even more fuel. The insulated cabinets, of which there are many clones as well, are zero clearance units, that burn very little fuel, as little as 2 to 3 pounds and are very space efficient.
My experience with running a kitchen, is that you get as much as you spend, buy cheap equipment and you will fight it everyday, making cooking a chore. Buy good equipment and you can focus on your customers and food. If nothing else, search this forum for backwoods clone. You can have an experienced metal fabricator make one of these up very quickly.
the meat thermometer was so far past the top reading, it read Taylor
"perhaps...but then again...maybe not..."