I dont think its possible to completely coon proof a brooder pen or coop or a run with just hardware cloth. The coon can get its paw through half in by half in hardware cloth. The chickens see the paw and get curious because of the moving fingers. Then the coon grabs the chicken and while it may not get the whole chicken out through the hole a chicken with only one leg or no toes on one leg is going to have to be destroyed. If you dont believe me, pm me and i will give you my phone number and you can talk to my wife about how our little turkeys which were a month old had the skin from their legs eaten and toes removed and some had their scalps removed through the hardware cloth. They also got a polish that was almost grown. In my opinion, hardware cloth is completely worthless without putting electrified wire outside it. With hardware cloth before electricity the coons were up to thirty dead turkeys and birds this year. After electricity, we havent lost the first bird or toe. However, we have had the privilege of hearing some coons and feral cats scream when meeting mr. 6,000 volt wire.