I've been extremely happy with our hoop run. Steel fence posts pounded in on each side, cattle panels arched between them, covered with chicken wire and hardware cloth about 2 feet up as an apron folded outward at the bottom and approximately 2 feet out. Cattle panels are cheap, expandable, and easy to work with. If I had the space, even on our limited budget I would be able to put up multiple runs for more than reasonable costs. You can vary the width of the run by how close you put the fence posts on each side. We added a little white vinyl lattice because it looks pretty and since our setup is in town and visible from the street on two sides (corner lot) we didn't want an eyesore cobbled up there.
The original run was 3 cattle panels long. This summer we expanded it simply by taking off the end piece, adding another fence post on each side, arching a new cattle panel between them, covering as we did the original section, then wiring the complete end piece back on. Easy, peasy. And not at all expensive! One of us stands on each side of it in the spring and we toss a roll of landscape fabric over the top as shade and rain protection. Yep, it does really cut down on water in the run - ever try to water plants newly planted in that stuff? Notice how the water pools in all the little folds and just sits there? Well with the landscape fabric in the arch, most rain runs right off rather than soaking in. And since it's air permeable, we don't worry about tarps holding in the heat in summer. In the winter we use clear plastic over the hoop for winter protection. Works so well I can brood chicks out in the run even when it's in the teens and twenties.
Snow load and wind hasn't even fazed it, and living in Northern Wyoming that's saying something..
Raising chicks in their pen within the run, visible on the left. The run is covered with clear plastic at this point for the winter season.
All of the photos above are the original run, before expansion. The landscape fabric was attached and wound around predrilled metal lath strips, found at Lowe's, so any of the sections can be rolled up like window shades.
These last two photos are of the expansion. The first one is how the end cap came off - it was just wire welded fence piece, covered with chicken wire. As you can see, it came off in one piece with the chicken wire, hardware cloth skirt and apron intact. We love this run, have had no problems with it, and even better we could afford it!