Last night I slapped together a roost system. 3 tiers about 10" between them (horizontally) and about 12" between them in height. I saw some photos on here of level roosts where the hens are all at the same height. I am thinking this would be nice for cleaning purposes underneath and possible would reduce in fighting. Advantages/disadvantages to level vs. tiered roosts? If I choose to go with a level system...is 3 feet off the ground high enough? thanks...still awaiting my delivery!