Our coop is done except for the roosts and nest boxes. I have an old fruit crate that I am going to use for one next box-it's about 24"X18". I also have two milk crates that I can use, but I am worried that they may be too small. I haven't measured them, but I believe they may only be about 12"X12". Would this small size deter the hen from setting in it? How big of a next box would you recommend in your experience? Oh, and how thick are your roosts? Everything I have read has said 2", but the 2" dowels we have just look HUGE.