My open air idea

[Mother of Chaos]

...In each separate section, you would provide a roost & in ladies section(s), a nest box. For only 3 ladies, only one nest box needed...

Whew, you're brave! I have three layers, and they already feud over the two nest boxes. Which is preferred to the other is inexplicable - they change every 2-3 days or so. As far as I can tell, the "best" box is the one that someone's already in.