I did one of these about two years ago. I cut out the bottom of the tamale pot and use a ceramic flower pot base sitting on a grill grate as a heat deflector. I also use a doggie bowl to eliminate the fire choking down from ash build up.
I'm able to hold 225 for 9 hours with both Kingsford Blue Bag and lump charcoal.
It's a terrific little cooker - and perfect for the typical family cook.
Hoping Weber comes out with a remake of the original Model 1880 (14 inch) WSM!
PFSmith, Weber Apologist, Kamado Joe enthusiast, Traeger Pellet Pooper Cooker - "Grilling is Therapy; Smoking is a Spiritual Retreat"