Exactly what I was thinking with the baffle and turntableI had a tank like this years ago that I wanted to make a smoker out of. I ended up having to move and my father in law wound up giving it away before I could come back and get it. I had the same thought placing a FB right under it with some type of baffle so that I didn't have a huge hot spot and then creating a turn table for my grill so that I could reach the whole thing from just one door.
Cool find.