No pics to prove it but I've done it on my UDS. However, I use an entirely different air intake approach that can be cranked open to provide more air for higher temps relative to 3 or 4 3/4"" ball valves that may not provide enuf air for a high temp oven.
Dr. Mark (STL)
Ph.D. (honorary) Bovine $hitology
A thin line separates paranoia from an acute understanding of reality.