Hello all. Been researching RF pits and now gonna build one. I have most of the materiel on hand except for the CC. What I have for the firebox is a 24" .500 wall x 32" long pipe. I have 2 options for the CC. 24" .375 or 30 " .375. Leaning towards the 30, but needing the advice from y'all. Also, has anyone built one off of plans from smoker builder.com? Are they designed correctly? If not I think I'll wing the design with the much needed help I have seen on here. Thanks!!