From what I've heard, an issue that's not pecking order related is that they can't fly up to roosts, so they will sleep in nests below other birds and get pooped on. Apparently you need a low roost or a ramp to a roost, and train them to use it.
Mine fly up to their roost fine. Well, jump and flap up the steps to it, like the other hard feathered chickens do.
They have feathered feet and aren't very waterproof generally, so bear that in mind if you get a lot of rain. They need an outdoor dry area during the day. A covered run is ideal.