The plans I have call for 1 1/2" vent holes with hardware cloth over to prevent critters from getting the babies. I don't have a 1 1/2" drill bit. The biggest I have is 1/2". I was planning to increase the amount of vent holes to make up the difference. Do you think I still need to put hardware cloth over holes this size? Should I go down to a 3/8" inch bit? I want vent holes obviously but if I don't have to put hardware cloth over them I'd rather not. Also my plans call for vent holes along the top of the peak, on the bottom of the nest boxes (which are located on the tallest wall), plus a chicken door across from the nest boxes. Do you think I should add more ventilation?