I am sure most use the hardware cloth over the entire panels. Personally I am probably gonna base mine off something like this https://www.backyardchickens.com/t/270088/permanent-hoop-coop-in-progress-update-see-post-34
Of course it couldn't be left just as cattle panels. Those are just the framework of the hoop coop. The question was which of those many various panels are the best option.
Wow that was a lot to get through and unfortunately I am just tagging along to get the answer to your first question. I am looking into making a hoop coop or two and was wondering which one of those panels works best.