Really neat design! I bet that beast is gonna make some good Q, let us know when you fire it up. From the size, my guess is you will need a pretty good sized fire, dry hardwood will help get-R-hot.
Weber 26.75 OTG w/CI grates & SJ/WSM Mini
Home built 24"x72" reverse flow stick burner trailer with 18"x44" grill w/CI grates and upright SS gas oven/smoker.
Home built 48" fire pit with a 30"x30" Santa Maria style ranch grill.
Home built lump charcoal retort, iGrill & a bunch of other cooking toys.