I agree with briteday. Also, check out my temp coop:
https://www.backyardchickens.com/forum/viewtopic.php?id=185353
Considering that you're more in the desert than me, in the Midwest, you'll probably want to put a floor in this, lay down hardware cloth (to prevent snakes--we don't have your kind of snakes in IL), and put the "tent" on top of cinder blocks, for greater airflow. You will have leftover plywood, and you could make a partial wall and ladder with the leftovers.
This project could be completed in 3 hours, INCLUDING the paint job. (Mine took longer, 'cause I'm not a great builder and I put on 3 coats of paint everywhere.)
Materials (incl. a floor)
(2) 4 x 8, 3/8in or 1/2in plywood
(1) 8 ft. 2 x 2
(2) 6 ft. 1 x 2's
(4) 6 in (leftover) 2 x 4's (to support the tent bottoms)
Screws:
(10) to attached ridge pole to plywood sides
(8) (2 screws each) to attach 2 x 4 bottom supports
(4) to attach 1 x 2's to bottom supports
Suggest (8) to attach Floor to sides
Hope this helps! It isn't that I've BEEN THERE. I A M T H E R E!!