Here we go (Imperial measures, hope that's ok):
The green one is -
5' 10" wide at the front
9' 6" long, front to back
3' 6" tall from ground to top of side walls,
5' 9" ground to apex at the front, plus the tin on top of that.
The sarking is 6" wide, with small gaps for ventilation (necessary for wet sheep)
The blue one is:
6' 10" wide at the front
5' 6" long, front to back
2' 10" tall at the back
3' tall at the front, with a single slope backwards.
Inside, there is a horizontal bar top and bottom to attach the sarking to. The green shelter has three roof trusses, one at each end and one midway. The blue one has a horizontal bar halfway back to support its roof. They have guttering to catch the rain and direct it into buckets for drinking water. You could though dig a trench all the way round and fill with gravel for drainage - the front gets a bit muddy in wet weather.
The actual measurements don't really matter - I think they were chosen to fit the materials to hand, but they give an idea of a size which is useable. The green one is easier to get into if anyone decides to lamb in there, but is quite deep so some sheep are sort of trapped at the very back. The blue one is wider at the front so less easy for any one sheep to block.
The rain comes from every point of the compass here, so we solved the problem of which way to have the shelters face, by making them all different. In the winter the sheep have access to all the grazing so they can choose which shelter to use. There is always someone who stands outside
Snow will get in whatever you do, but at least they have shelter from the wind and the worst of the snow

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