I have made several Cattle Panel hoops coops and am making a 4th. I will attempt to document this 8x8 as I go along.
They are loosely based on Chook-A-Holics https://www.backyardchickens.com/articles/permanent-hoop-coop-guide.47818/ but I used 2x4's and added 2x4 field wire over the 1/2" hardware cloth, instead of electric fencing.
But here are some pics of some I have made:
The first one is a 8'x 24' and I thought it would be big enough FOREVER!! when I built it over the winter 2015-2016. I finished it March 2016 and it had 8 chickens in it. I have a purple used coop and a old wooden dog house that are used as Huddle boxes for molters, nest boxes and a place for broodies to raise young.
South end in spring
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and in Winter, with turkeys and 26 chickens ..the south end is completely open for ventilation.. the 2nd, a 8'x8', is visible to the left, the turkeys were supposed to live in it but they had other ideas.

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I had to divide the coop in half because the turkeys harassed the chickens..
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looking at the big coop from the north west. The apron that is 1/2' hardware cloth is visible..The structure the egg basket is hanging from is not part of the hoop coop... it was existing.
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North end of 8x8' coop
in summer when the turkeys still lived in it.
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and in winter
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and now for the new coop
It is not being built on level ground. As you can see it is leaning a bit to the west...
In this shot you can see how the base is configured and the panels go inside the base on mine... other people put them on the outside... I build the base, stick one end of the panel in the base , lift the other end and walk it up and bend it so I can stick the other end in the base... no pics I am doing this by myself.
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Well I took pics today, computer said it downloaded 27 and I deleted off the phone.. this is the only two I could open .. shows the cattle panel cut to fit around the 2x4 and a additional support I added to this coop .. because I plan on moving it as a tractor.
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end supports and some HC attached to wood
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cutting off the extra HC wrapped around from the front .. some people do this after the HC is on the cP's.. I like to do it first and have the HC that goes over the hoop hold it down
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you can sorta see the extra is cut off so it covers the first square of the CP.. then cut at the curve so it lays flat. wire ties hold it down temporarily.. later the HC over the hoop and hog rings will hold it down.
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photo out of order, but cut the ends of the base so I can drag it with out digging in
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door detail of another coop
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The CP rests on screws w/washers 1" up from the bottom of the base.. just to hold them up
I use plumber strap to connect the CP and HW to the frame instead of staples.. too hard for me to hammer... I did use screw and washers, but kept dropping the screws.
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on the coops w/one door I shove a 2x4 between the cp squares..I have a screw sticking out the bottom each end that holds the board from sliding out
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more pics to come