So picked up some barrels today. Never used. CLEAN. two threaded holes in the lid. The kettle grill lid I wanted to use is too small. How many grates can a guy put in a" original lid" UDS? I mean- with enough room for pork butts....and cook evenly. Im looking to replace my 4 rack propane cabinet smoker. Id like to be to able to do at least 8 butts though! without the kettle lid Im wondering about how low that bottom grate can go,,,A diffuser seems like a MUST right? My lid isnt a weber so I may need to scrounge one of those up. Id like to build a pile of these things though...and with a source of clean barrels....sky's the limit!