How far apart are your roosts? I'm thinking I would rather do same height roosts over stair step to prevent too much squable over the top roost. I'm thinking 4ft high with an elevated poop deck so I can save the floor space under the poo deck.
About 20" or so, on center. Far enough so one bird can't bother another on the next roost. (But sometimes, a bird can get willful, and hop over to the same bar.)