Neat design, I look forward to seeing it come together. Just a thought: if you think you might want to do a whole hog, 2 doors can be a problem. I built my rig with a single 50" door on a 72 inch tank; no counter weights (yet) and it's not to heavy. I've done +50# whole hogs and think i can fit up to 80# in mine. Just something to consider.
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.