If you decide to make all or part of just one side, ideally the winter windward side, of a solid material, like plywood or wood fencing slats, that could end up being less costly and would provide a windbreak. I don’t know how much snow and cold wind you get, but I built my run with one solid side to both manage costs and offer some shelter in the run from the wind.
We have raccoons, opossums, foxes, hawks, owls, snakes, cats, and dogs as potential predators. I have hardware cloth all the way up and over the roof of my run. This may be overkill, but our neighbor lost all of his chickens to a fox and my ducks remain alive and safe. The roof is also covered by a heavy duty tarp to keep things a little drier, since we have rain and snow to contend with. This cuts down on the attention my girls get from airborn predators and is an extra layer of protection from raccoons and opossums who are expert climbers. I notice that my dogs’ claws could do damage to the hardware cloth down low, so I sealed the edge of the hardware cloth along the bottom of the run with wood trim and attached some 24” welded wire fencing I had lying around to pieces of 2x4 screwed to the the outside of the run so that the fencing sits about two inches out from the hardware cloth, making it harder for my dogs to get to the HW cloth. I put screen door grates on the lower parts of the doors for the same reason. My run has a solid surface floor, built on joists sitting on concrete deck supports because of the city code where we live, so my build may be quite different from yours. The picture was taken before I added the WW around the bottom and before I put another door grate on the side clean out door. My duck house is attached to, not inside my run.
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