That is basically the idea for the current Jumbo Joe line that Weber has. Unfortunately, I feel that I could never get adequate airflow through it. Twice, I have loaded it up with a full chimney, tossed food on the grate, and then watched the temps plummet. Even though the top and bottom vent were 100% open. I think your grill should fix that issue due to using a standard 18.5" bowl. I like it, and will probably go the same route if I can manage to come across a 18.5" grill that I don't mind drilling some holes in. Nice work