Car54,
Freakin' awesome. Inspirational, to say the least. I have the backyard shed all figured out (having a local Mennonite farmer build me one - cheaper than building it myself and a lot nicer looking as well). Once I get that in next spring, and run power to it, I will be designing and building a setup much like yours. Thank you for your photos.
This forum is a great place to get good ideas.
As for your extra heater, I ran into some timing trouble when my pork back ribs were taking a whole lot longer to cook when I went from having normally two racks in there to having eight! I could not get my temperature up to 210. Slowed the whole meal down considerably. With a BS full of meat, and your extra heater working, the hot steam must just pump out of the top.