Hello everyone, I've been lurking awhile reading up on everything and now that I have finally started my coop, the one question I have is how big should the chicken's door to the coop be? Most plans I've seen and the plan I'm basing my coop off of ( the triangular tractor from Organic Gardening magazine) never seem to mention door size. I need to really know what the minimum size can be for regular chickens ( I'm getting a couple of Barred Plymouth Rocks and a couple of Rhode Island Reds). I don't want to cut to large of a door since the coop space is small to begin with ( it's cut in the floor with a ramp leading up). Thanks!