Really interested in the data on your cook. The elapsed time, outside temp, wind, moisture level, charcoal stack and quantity used. Wondering if a double wall pit is really needed and would it save much on fuel. Down here in Texas land it would probably be years before fuel savings offset the cost of a pricey pit. Maybe an Acorn would be nice for cold windy days, but you can put a big brisket on a 26. Hope your brisket comes out awesome!