What you're building isn't about something to keep chickens in, it's something to keep everything else out. Chickens will stay near home on their own. But they need protection from predators and the elements unless you want to replace them all the time. You'll have much better luck if you build the coop to keep things out. Right off the bat you likely have Raccoon, Opossums, snakes, hawks, and coyote. Fox likely. Bobcats maybe. That means no chicken wire. Chicken wire also let's in mice. You'll lose a lot of feed in an open air coop built with chicken wire. You want to encourage snakes for rodent control, but limit the snakes ability to steal eggs.
The best thing to use for wire is 1/4 inch welded hardware cloth. Secured with screws and washers. Coons can pop staples if they're the small 1/2 or 3/4 inch. Raccoons only need a 3 inch gap to gain access. Coyote and fox will dig in from the bottom. Or climb the top if it isn't covered. If you have the birds up on wire, chicken wire specifically, a coon can get it's hands through that and grab anything it can reach. If a roost is up against chicken wire, you'll find headless chickens from where a coon got himself to roost height and reached right through that wire for a bird.
They'll be cooler in the shade with access to the ground, they'll dig down to cooler soil and dust bathe in it. Free range time will reduce your feed bill and make better eggs. Coop space needed when combined with free range is 4 sq feet per bird. If no free range, they'll need an additional 10 sq ft of run space. This avoids bickering, bullying, feather picking, and reduces the odds of egg eating (which can also be nutritional from nothing to eat but feed when cooped up)
So really, think about what sort of eggs you want, how many birds you want, what predators are in your area, and then decide what sort of coop to build. Also consider the weather. How often does a big storm blow through, and what direction does the wind blow the rain most often? The side the wind comes from should be solid.
