It's all been said already. I farked with a liner for while. Got an new unlined drum from McMaster Car. READ EVERY POST, and take design notes.
Also take note of all the NEAT IDEAS that did NOT WORK WELL. KISS rules. Air flow controls heat. The less air leaks the better heat control!
Yoder YS1500; Yoder YS640; and a Weber kettle! Purple Thermapen
Senior Judge, SCBA
Carolina Pit Master