Inside, we put roosting bars, which have slightly rounded edges.. We dithered between roosting bars and perches. We decided to start with roosting bars. Everything is, of course, dusted with Diatom.
For cross ventilation, we have holes just under the eaves in both sides, covered with mesh:
The Girls are laying eggs in the nestboxes, but they aren't sleeping in the house. That's not surprising, as they still have the older houses to choose from. We will be dismantling and disposing of at least one of the older houses soon.