I have no idea about the housing issue (in fact I'll be interested in the reply), but yes, I have read that chickens do get depressed. Also that they don't like being alone (that can spark a depression) and they prefer to have at least one other of the same breed as them.
I have 2 bantam golden laced polish with my standard hens. Mind you they are the low hen on the pecking order.
But when I first got all my chickens in my order I purchased 4 millies and they were all killed. I don't know if it was the breed or what.
I think that they do get depressed. My girls havn't been their normal active selves since their roo died yesterday. They were all fine, let them out to free range and when the roo died they all went into the coop and never came out for the rest of the day.