I used something similar for my roof, and I just covered the top in chicken wire, before attaching the corrugated roof pieces over that. This way, I avoided having to cut perfect, complicated curved pieces for the corrugated roof to sit on (I'm sure I would have ruined several pieces of wood trying to do this) plus it gave me a little more ventilation.
My coop is 7' wide and the corrugated pieces are 8' long, so I placed them to extend outwards mostly on the high side, creating an uncomplicated overhang. On the low side, I extended them only about an inch, to direct rainwater into a gutter that runs into a water barrel. It's worked out really well, in spite of my unskilled carpentry!