Well, just got to the thread and wondering how it is going? Is dinner ready yet? The pit will get more efficient with the mods, but, it is a bit of a charcoal hog, as you now know. Some folks drape a heavy fire blanket over the smoker, if you are facing south, you can leave it in the sun in WC and get some more free heat from the sun.
You should have done two butts, make this a practice, I can then come buy and pick mine up when they are done.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."