The 6" x 6" hole needs another hole opposite it to be of any use as ventilation.I'm sorry, but the giant 6" x 6" hole inside the coop, which is pictured, isn't ventilation to you? Look at the picture of the chicks inside the coop. The ventilation hole is clearly pictured. The ventilation hole is covered in hardwire as well, although in that image it was chicken wire, but it has since been changed. In addition, the chickens go inside the coop at night and are locked up so there is zero need to use hardware cloth on the exterior of the coop. Given that most predators prowl at night, I have a dog, and my entire property is fenced in, I'll take my chances on using lighter weight and more affordable chicken wire. For my purposes this was never intended to be a full-time coop. I put my spring time chicks in it, broody hens, injured hens, etc. I have a large 10x15' Amish built coop for the regular flock.
It's everyone's personal decision on how much risk we are willing to accept.