Lots of shade, lots of water. Be sure and have several sources of water available in shaded areas just in case one gets turned over. Miss watering them once and you are out of business.
Water left in the sun can get too hot to drink.
Set off the lawn sprinkler a couple of times during the day.
Sheet metal gets too hot to make a coop, it is a real oven. It you use it to make a shade, make sure it is high enough off the ground. A high shade is a cool shade.
We used to make our coops out of palm fronds, palapas are what they are called. No walls, just roofs of palm fronds. Let the wind blow through them. You can get them free. Cheap and easy.
Rufus