Well, I managed to get the door frame plumb and level, but the door wasn't. I had to jury-rig it:
https://www.backyardchickens.com/threads/fuzzis-chicken-journal.1550586/post-26557799
Thank you, kindly.
@Rosekitten I am also in NC, east of Raleigh. I was going to make a traditional wooden coop out of pallet wood, but I am in my 60s, small, not experienced in building, and my dh is disabled. The hoop coop I eventually built I did almost entirely by myself with a drill...