I bought my GOSM yesterday morning (on sale, too!) and will be assembling it on Saturday and then picking up what I need that afternoon, hoping to smoke on Sunday. I'm thinking about starting with a bone-in pork butt. Is there any reason to not do a 4 lb piece? At this point 8 lbs would be too much as the family will be out of town for the next while. Also, what's the difference between skin on and off? My butcher has asked me before, so I always just asked for skin off. I still haven't been able to decide on a rub either... any suggestions? I figured I'd start this thread now and then just keep posting my questions and updates as I go. Oh yeah, how hard is it to assemble a GOSM?