Opinions from Montana east of the continental divide. Our previous coop was on a property with no trees and only sage brush and grasses. Wind you describe, I can relate. The pictures you uploaded, the walls of the coop do not seem to be 100% solid or sealed, I would look at getting a solid piece of wood on the windward side of the coop and panel up all the hardware cloth openings and then assess over the following couple days. If the wavy panels you are using for a the roof are mounted to a flat edge with no sealing, that is probably plenty of ventilation. A basic temperature/humidity sensor in the coop with a display in the house will give you the information needed to know if there is enough ventilation.