Since i having so much fun on the roof i was thinking add a sky light or two? 1-or 2 like this on the south side of the roof? Maybe in the middle, or towards the end so you could sleep and look up through the skylight and see the stars at night. Probably 1 is enough in the middle. I think the higher the up they are the better to install, less rain. Would it be strange to put right at the top above the collar tie? Say 12 inches bellow the ridge vent? since the interior is finished all the way up. Drier up there and more light to catch. You lose a lot of heat with these things, maybe 2x2 is better?