Is there any reason to make the walls solid in a coop contained inside a barn? Could the walls I am adding just be hardware cloth, properly framed of course, from floor to ceiling? Would the hens prefer a more enclosed space?
I missed this thread when it started last year. I would have said then, and you have probably figured out by now, yes, in cold weather it's great to have your coop inside a protected building!
Our winter coop is inside a corner of our barn (which has couple stalls for horses but they live outside; the barn is primarily hay/feed storage, tack storage, and work space). The first two winters we didn't have a covered run (just poultry netting) and once the snow came we used a 12x12 stall, bedded several inches deep, as a winter run. The chickens LOVED that.
A year and a half ago I built a hoop run behind the barn and last winter we had to force the chickens from their coop inside out to the run - they really preferred the stall! This winter wasn't so bad, they didn't try so hard to stay in, but 3 of our 4 remaining hens are too young to know that staying inside is a possibility. We still have to keep the barn doors closed or they'll hang out in the aisle in preference to the run.
But I really want them outside during the day because I'm willing to put up with the dust from nights in the coop, but not from them scratching all day in a stall.
So if you're in Wisconsin and are using the barn only for the chickens, and the dust on everything, everywhere, isn't an issue, you might even set up an indoor run space, if only for the nastier weather.
But to your recent question - I really don't know if all wire walls will bother the chickens or not! My coop, sized for up to 8 birds, is the back 3' of a 12x12 bay (i.e. stall space but with no front). The front/dividing wall is closed 3' at each end, then the middle ~6 feet (more like 5.5') is hardware cloth double doors. The roosts are tucked in behind one of the walls so they do have an enclosed space, but honestly I don't know if they prefer that. I built the solid walls because I have things in front of them rather than to give the birds privacy. My gut would say the birds will probably be fine with what you're planning, given where I've heard stories of them roosting.