I brewed this last night as a 3 gallon, full boil, no sparge, BIAB. Had no problems hitting the right volume or final gravity. I did a few things differently though. I doubled the percentages of black patent, roasted barley, and chocolate malt based on another brewers recommendation:
Also, I first wort hopped with the 15 minute flavoring addition, threw the whirlpool addition in at flameout, and then let it sit without chilling for 20 minutes. It's fermenting in my chest freezer at 64 degrees right now and I will most likely leave it on the yeast for 4 weeks before oaking in secondary. Looks to be a mighty brew and hopefully, it'll be ready by Christmas.