While we are advising you about expanding/improving your chicken facilities... may I suggest you reinforce your chicken wire with hardware cloth (hwc) with 1/2 to 1/4" openings? At least from the ground up to a height of about 2 feet at least. Chicken wire is designed only to keep chickens in, not to keep predators out. A raccoon will reach in and grab a chicken by the head if it can, with predictable results. Chicken wire will not deter snakes, rats or mice, either. And most of us have found it adbvisable to place an underground "apron" of hwc around the chicken run as well, to a distance of a foot or two out, to deter digging predators. Good luck and enjoy!