A pretty design. What first comes to question is the king post truss. The size of the tie beam? All the members are present, curious if the king struts should be pushed more to the ends of the tie? Thrust from the rafters should not be a issue, but that is a lot of weight on the 4 tie beams, it is not transfered directly to the post, with that scrunched up truss.
Then there is the cantilevered top plates and the weight of the dormers. I used to think sheet metal would shed snow. I now have a valley in a roof on my own house, laded with snow, a lot of snow. It is heated and perhaps some of the cause due to snow sticking to the roof, ice is present. On a cold roof I am curious if the snow will shed in a valley? I had to remove some of the snow as we were up for some rain.
I don't really have any qualms with structural ridge beams, nor with common rafter with their thrust. Just different ways of dealing with stuff.
