It looks pretty good! Just a little sprucing up is needed.
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maybe you could make something smaller inside the barn because you only have a few birds. Keep the nest boxes if they are comfortable using them, and give them some room to roost at night, sounds like they free range during the day, so let them do that. I would like to have the options that you have with that building. pics please.
After looking at the other pics, the nest box area may have been a coop as there's a door on the inside and a pop door going out. That deep litter that you'll get on your feet will wash off. You'll get used to it.