Hi. When u mentioned hardware cloth, i knew u had a good grasp re what u need to build to keep your future chickens safe. (Many people have never heard of hardware cloth.) I have large runs made from 10×10x6ft chain link dog kennels attached together. The chain link is then Entirely covered in 1/2" hardware cloth. The tops of runs are also completely covered with hardware cloth, with a metal roof added to keep runs dry. Finally, a hardware cloth apron is flared out 3 feet to prevent digging. (Lots of trees shade the runs, so hardware cloth is flared out so tree roots were not disturbed). If your run is 100% secure, yes u can leave coop door open 24/7. Like you, i live in a very rural wooded area. The reason i covered the runs entirely in hardware cloth was to keep out snakes & rodents along with other predators. But covering the entire run gets expensive. If u cover the bottom 3' of chain link with hardware cloth to keep raccoons, opossums, etc from reaching in, u Should be fine using heavy gauge 2×4 welded wire or similiar wire as an apron, and also using heavy gauge wire on top of the run to keep out climbing and aerial predators. (Unless u have weasels, mink, etc. 2x4 wire will also allow rats to enter). I used LOTS of zipties to attach the hardware cloth to the chainlink. Harbor freight has best best price i found on zipties. Hog rings, metal zipties, etc ARE more secure than plastic zipties, but the plastic zipties were easiest for me to use. Black zipties are more weather-resistant than other colors. And like i said, i compensated by using lots. U should be able to find used metal roofing as well as used chain link. Builders often have left over metal roofing from homesite builds. Not necessary to have roof cover over run, but esp with feathered feet breeds, u will probably not want them outside coop if run gets muddy from rain/snow. If u go to extra effort to build a good secure coop and run in the beginning, u will have peace of mind that your chickens will be safe. Ive never had a predator get inside my coops/runs. Im not certain my set-up would keep a bear out. There are black bears in my area, but they are rare, & ive never seen one on my property. I know u are going to really enjoy having chickens. Good luck & have fun!