This is such an interesting idea! My hubby has been planning something similar for our future chickens. I guess I was worried that they would need guidance to get from one end of the tunnel to the other, but maybe that is me falling into the 'dumb chicken' stereotype :) You have proven to me that this can work and can be a great way to get the chickens from the back yard to the front without them having free reign in the gardens around the house.