The chicks are getting bigger every day and the brooder isn't holding them. I would like to get them into their coop by the weekend. I'm building a roost lke one I saw here. It will be a triangle with a straight side against the wall. I was thinking about 4 feet tall. How far from the floor should the first rung be and would I need to have a ramp between rungs so they get to the top or will they fly up to the top?