Ventilation wise, you can't see it in the photo, but the whole top perimeter where the roof is placed on the frame has a 2-3 inch gap as the 2x4's the roof sheathing is sitting on are placed on their side, so the whole roof is sitting 2-3 inches above the frame. I'd think that's enough ventilation? If not, I can core drill some 2 inch holes about 1 foot down from the top (since hot air rises, or should I make some in middle and some at the top for circulation?) I live in the country and weirdly enough I've never seen a raccoon here. I've heard skunks are the killers around here.