Cody you seem to switch back and forth between what wants to be wood gasifiers and want wants to be charcoal gasifiers.
Here are three plates of dimensions for your internal air-ring type:
I think pure charcoal would heat kill your air-ring.
Actual charcoal gasifiers use internal charcoal to radiant heat shield the system metals from active charcoal energy release damage.
Wood gasifier use the woods humidity to heat moderate.
Hundreds of pictures and system diagrams have been put up on this topic by Chris Seymour and Francois Pal and others.
S.U.