Good Morning. Found this site while I was looking for information on building a UDS. Been smoking for a lot of years using retail equipment, charbroil offset, Kenmore (sears) cabinet propane smoker and a smoke box for my Weber Silver C. All of which work just fine but none of them have the cooking volume needed for large crowds. So I've been collecting parts to build my UDS. I have 2 new open head drums and have purchased the Volgelzang deluxe kit. So like others have done I'll post my progress. I am going to attempt to do a reverse flow on the in the smoke drum so I'll be putting both firebox chimneys next to each other above the fire box door. According the the calculator, very nice, that should give me the heat flow I need from the firebox and with a piece of sheet metal directing the airflow in the smoke chamber to the rear then over the cooking area then out the stack, it should work. Again, great information here nice to find such a sharing site.