mdquilts
Songster
We have the clear wavy plastic panels covering half of our run and placed over the pop door like your sketch. We have shade from trees in the morning and made it through the hot humid summer just fine. Our panels are well supported and on an angle because I was worried about the weight of snow. Whatever doesn’t slide off I can easily remove with a snowbroom.
Whatever works! I'm a designer and love building things for fun, so part of this is just me having fun with a new project 
The top of the run will be slanted to help snow slide down, and I have a roof rake to help it if it doesn't.