As always your mind is working, and considering the logical. But some things don't follow logic, consider the bee, engineers swear it should not fly, but yet it does...
I've often looked at your products and can see the brilliance of your thinking, always considering space and efficientcy. Please build a UDS! Really build one, play with it for a few cooks and your mind will spin! The seemingly wasted space above the charcoal basket and cooking grill, effectively baffles the live fire yet lets the fat and rendering juices fall into the fire providing moisture and flavor. No deflector is needed , although many argue for one.
The large charcoal basket really isn't needed, until you load six pork butts in it and let it cook 14- 18 hours without need to adjust. So the large basket is to be flexible but only fill what coal is needed or snuff when done
Consider the types of heat that is provided by the UDS, radiant heat, convection heat, conducted heat, you will not see that in many cookers. Then consider the barrel shape and how those types of heat travel in it.
You like to tinker and you like woodpellets , try another UDS and change it to woodpellets, or your gravity burner. I'm sure you will have much to say about it once you try it.
Hook Line and Sinker
Viking 30 inch Gravity Fed Charcoal Smoker
Brinkmann 5 burner gas grill with sear & rotisserie
UDS's 3 and growing
Char Griller w/SFB w/mods
Charbroil 7000 Gas Grill