Thanks, Michael. The store was out of bone-in, so I got a 3.5 pound boneless one and coated it with just a little olive oil and a rub made out of whatever I could find in my cupboard that worked and refrigerated it overnight.
As far as technique, I used basically a whole chimney full of unlit briquettes (KBB) with hickory chunks tossed in there and lit 8 briquettes and added them to it. It was kind of a windy day, so I left the bottom vent completely open the entire time to make sure I kept the temp right around 225. It got up there probably within about 20 minutes and stayed pretty steady until about 4 hours into the cook when the ashes started clogging the bottom vent. I emptied the ashes and added about half a chimney of unlit and 5 more lit to keep it going. All in all, it was on for about 8 hours or so. I had a round cake pan sitting down on my bottom grate filled with water to act as a diffuser/heat sink as well.
The only real issue with the cook was definitely the ashes, and I can understand why people would prefer a SJG for one of these builds. I'm going to take a shot at a bone-in butt this weekend, and I'm already making a few more mods to get the best performance out of the little guy as I can. Heading in to work in a little bit, but the plan for tomorrow is to build a charcoal basket out of expanded sheet metal to get the most from the coals that I can, and I'm also going to make a vent cover out of a can as well (one of the stray cats in the neighborhood is going to enjoy some "fresh" tuna because I'm not eating it). I think with these two additions to it, I hopefully won't have to add any more fuel during the cook, but I guess we'll see.