Here's one I thought of building.
https://www.backyardchickens.com/forum/viewtopic.php?id=266952&p=1
it is toward the bottom of this page. On another thread he tells how he built it. You might PM him. It seems easy and not too pricey. Only, if I made it for Phoenix, I would replace at least one wall with hardware cloth.
https://www.backyardchickens.com/forum/viewtopic.php?id=266952&p=1
it is toward the bottom of this page. On another thread he tells how he built it. You might PM him. It seems easy and not too pricey. Only, if I made it for Phoenix, I would replace at least one wall with hardware cloth.