Holy smokes that thing must weigh a ton. Very impressive build so far, I agree with Dixon about the layout of the chipped stone looking really great. I don't have much in the way of advice for you unfortunately. My only suggestion might be to change the roof sections around the exterior from the sloped half-roof that they currently are, to an arched roof, or a smaller full triangle (not just the sloped half) to reduce the current "sled" look for that side of the build. I think the interior roofing, that slope on the inside of the main "U" shape of the building, look fine. I really don't think there's anything wrong with the roof as designed though, honestly. I just look forward to seeing more of this behemoth progress.