Here is my cattle panel run, its a 16x16 with two gateways, this is for Turkeys, Chickens and Guineas. My fiance James and I are putting welded wire around the cattle panels to make the holes smaller so the Chickens and Guineas cannot escape. We are putting a chicken wire roof on it with a tarp over that to protect from snow which we got hit with 4in last night. This project is still in the works but even the temp setujp everyone can be outside and play and already know the herding drill to go back inside the coop even the Guineas.
If you get heavy snows where you live and your run is 16 ft. long by 16 ft. wide, it's likely your tarp run topper will collapse under the snow, even with chicken wire under it to support it. You'd need some heavy duty bracing or arches to avoid a collapse with a setup like that. I've seen that time and again with folks around here.