I haven't found anything on the web on this. Can't believe I'm the first one to think of it. Maybe not using the right terms to search. Anyway--any idea on the idea of stacking two 55-gallon drums? Cut a door in the bottom onefor fuel, add intakes like uds, then cut a large door hinged on the side in the top one. Add three (maybe 4?) grill grates in the upper one, and you have a UDS with a vertical chamber to do more meat at one time. Does anyone know of any info out there on a setup like this? Thanks.