We use metal roofing to get the snow load off and its a pretty steep pitch of the roof, it cuts down on some of the hay loft space but better than having to climb up and get snow off the roof or damage the building this year we had 130 inches of snow we beat the average snow fall by 10 inches that's a bunch of weight along with 100 bales of hay at 90lbs each and A BUNCH of sack feed.
All the barns here also use metal on the roof. The one on our barn here has to be well over 50 years old and other than one repaint a few yers ago, has held up great.
We talked to one builder a little while ago and his rough quote was fairly good for the basic structure. He has another guy coming Friday I believe to quote. My brother-in-law want mostly machine storage, but room for a few horses, etc.
Big no explosives, Bulldozer and Trackhoe are the best therapy a man can get. I am quite envious of all your pictures.