My current build in progress is copying @21hens-incharge 's cover technique:
I'm not building a base frame, but using steel t-posts to hold it in place. Blooie has one like that. I can dig out the links, if you like. But, since you are putting this in a barn, that may not be practical.
I'd...
@poultryprofessor was working on updating these for her university (not sure if that project has finished):
http://www2.ca.uky.edu/agcomm/pubs/ASC/ASC189/ASC189.pdf
These are handy if you like some detailed instructions.
Yes, ms biddy's is one I was going to list.
This one looks super sturdy:
https://www.backyardchickens.com/articles/permanent-hoop-coop-guide.47818/
Aart's is mobile:
https://www.backyardchickens.com/articles/aarts-hoop-coop-chicken-tractor.72211/
I just like the way this one looks...
There are some good articles on free ranging that might have some good tips for you:
https://www.backyardchickens.com/articles/bees-key-points-to-successful-and-safe-free-ranging.65895/
https://www.backyardchickens.com/articles/free-ranging-your-flock-by-one-who-free-ranges.73488/...