This is what my awesome husband whipped up for me with stuff we had hanging around the house. Total cost: $8.32!!
The door on the end slides up and down, which was tricky to make work, but it's good enough. The shelf in the back will be where the future nest boxes go.
Do you think I need roosts? They will only be in this for 2-3 hours at a time during the day to forage. They will have a run off their coop. I will have to get a piece of tarp to cover a section for a shade area when necessary.