why do the roosts need to be higher than the nest boxes? my coop is finished except for putting in roosts and nest boxes in the morning and, naturally, i'm just now realizing i was probably planning it wrong.... the original plan was for the roosts to start at 1 1/2 ft and go up to 4 ft (stair-stepping). the nest boxes were going to be on the opposite wall, 2 levels about waist and shoulder high (i'm 5'5"). now i'm not sure what to do. i've got 2 silkies but the rest are standard brahmas, wyandottes, EEs and orpingtons.