Have you called anyone to price what it would cost to fence this area? It might not be as "expensive as you think" if you were to add up all the costs of your own material; posts, wire, braces etc and so on. Around here in Va the going rate is about $3.50 a foot. That's everything, done completed. I realize that alot of the people on here are retired, and didn't win the lottery lately, and/or like me, have some limiting factors like my ankle/knee joint difficulties. The cattle panels are nice especially for short distances where stretching is a pain or next to impossible or would require too many posts/braces to make it practical. And the added extra is that it is easily removed for a gateway or something else. Regular cattle panels will have openings too big to keep the chickens in. The "combination" panels have smaller openings on the bottom but still will let chicks and small chickens through.These are both in the 4 ft height. Then there are hog panels that are 37 or 39" high and the horizontals are a bit closer together but chickens will definitely got over. The ones with the smaller openings are nice but yes, much more expensive.
I am all for doing things yourself. But I no longer can do the fencing like I did even 5 years ago. If my son can't do it, I will have anything done that I need done, and figure out a way to pay for it. I really think you ought to at least get someone out to look at it and get an estimate. Then you will know what you are looking at and can make a list and figure what the materials alone will cost you. If you were to, say, do it in cattle panels, then figure the cost of them and t-posts and clips and get a real rough estimate of the material costs. Just as a general guideline. There is one other BIG plus to having it done....it is done and finished in a day or two instead of it taking a week, or weeks, to do it.
Ask at the coop if there is someone who is looking for some side work and pay by the job and you supply the materials and some help too....That way they are not dilly-dallying along like if it was an hourly job.