I'm back with more building questions. I'm trying to decide how tall my roost should be. I have 5 breeds... Buff Orpingtons, Lav Orpingtons, Brahmas, Austalorps, and Ameracaunas. I keep reading that the roost should be higher than the nesting boxes. My question about that is two-fold; A. does that hold true even when the roost is located along the opposite wall? B. why does it need to be higher? Next question... I'm planning to build a multi-level roost over a litter tray. I need the litter tray high enough off the ground so that the chickens can walk under it (the pop door is located under the roost). How high off the ground should I place the litter tray for their head clearance? Finally, how far from the wall and ceiling should the highest perch be? The roost is going to be located on the same wall as the door that we will enter the hen house (the north wall). On the west wall, there is a 48" x 12" ventilation window one foot from the ceiling. The second ventilation window is located on the east wall but it's much lower and further from the roost. How far from the ventilation window should it be? Also, for a bit more info, the nesting boxes are situated on the south wall in two rows (one above the other) of six boxes each row. They are 32" off the floor to the lowest level and 56" to the top of the upper level. They will protrude out of the wall for easy egg collection when we have our son "chick-sit" for us. I was unsure of how high off the floor to place the nesting boxes so I located them at a height that would make collecting and cleaning easy for myself. Thoughts? It's not too late to change things if I need to.