How tall should an A-frame be at its peak? This will be for both standard size and bantam chickens. Overall dimensions I am planning to be 6' L, 3' or 4' W and not sure how tall yet. 2 of the 6 feet should be the housed roosting/nesting area. Sound ok? I am planning to start building this weekend, supposed to be in the 40's and 50's F*. Thanks!