WOW! That looks great to me! With that much fat seems to me it shouldn't be dry. Did you wrap in foil and a couple towels and let it rest at least an hour? If you did then I'll have to agree with timberjet, must have been overcooked. I think the Pro's say let it rest for 15 minutes for every hour you cook it?? Maybe one of the members can correct me if I'm wrong. I have trouble finding ANY pork if that much fat. Even many of the pork bellies I get I consider a bit on the lean side. You don't have to eat the fat if you are watching your health trim it as you slice, ( give it to me! ) but I firmly believe that the fat is where the flavour is and keeps the meat moist. Looks like a very good first attempt with a new smoker.
If it turned out on the dry side I wouldn't eat it. You are only about an hour away, just wrap it up and I'll be there soon and take it away for you. Also if it was dry it may be that new smoker you built so I can bring the pickup and haul that thing away for you as well since I'll already be there.
Great job! Keep Smokin!