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!
UDS, Brick Red Weber Performer Platinum, Blue 22.5 Weber Kettle Gold, Bradley Electric
Carolina Pit Master