I'm trying to design my first coop. It will be a small coop with a run. The plan was for a 8x4x4 run with a 4x2x2 coop 2 feet off the ground. This will only be for about 3 chickens. My question is, will 2 feet tall for the inside be ok for the coop or should I make it 3 feet? Keep in mind I will be adding nesting boxes as well. Thank you!