My run is fully enclosed in 1/2" hardware cloth. In the center, I have a post dug into the ground and attached to the main "ceiling" bar. From there, I hung a shower curtain from the center to one side. I can partition off 1/4 to 1/2 of the entire run, by running plain plastic fencing from the post to either side of the run. If I put a roost, waterer, and feeder in there, I have another temporary coop, especially if I put clear tarps around the outside (the roof is always covered). A portable nestbox makes it acceptable for any age bird.
I have used this setup for look-don't-touch integration, and for my bully, who's been living in there problem free through some very cold weather.
If I have the whole run open, the shower curtain provides shelter from wind. A feeder and waterer are on either side of it, so chickens can't see the others.