Being a big fan of goat and having "not eaten enough of my share"
I can offer you a couple pointers.
You didn't mention the size nor age of the goat, both of which are critical to proper cooking.
Most Boers, raised for food, are eaten at under a year old and weigh around 50-75 lbs live weight. This gives you very little meat on a front quarter (shoulder) after slaughter. I would recommend AGIANST smoking this because the meat is way to thin at the thickest point and the cut is mostly bone. Grill that baby over direct heat and enjoy the meal.
If you want to smoke, do the hind-quarter. It has thickness to it and a decent amount of meat that will make it worth your while. I have not smoked goat, only barbecued it. It has been excellent everytime. If you still insist on smoking it, do the hindquarter over any wood you like, since goat has a fairly strong taste. I barbecue over mesquite. Goat, even kids are kinda fatty, so I wouldn't worry too much about a water pan, though I would mop occasionally after the first one or two hours with a mop that includes olive oil or some fat to prevent the young-meat from drying out. The majority of the fat on a goat is intra-muscular, meaning it is within the muscle fibres and very little on the surface that acts as a "cap" or protector.
Can't give you temps or times, but I would definitely say that just like any bone-in meats 190-205 F is what you want to shoot for.
Good luck to you and don't forget the pics! Lead the way, buddy!