That is a really nice roost. Easy for them to "step up" and get higher. I'll tell you from my limited experience they are going to want to be on that top rung and there isn't enough room for their butts! Or their beaks if they are turned the other way! Could your husband make this an "A"...
Do you mean you have a problem with them piling up together? If so, at 9 months they are a little old for that behavior unless they can't fly up to the roosts. You could place each one on the roost at night. Are you roosts to high for them to reach? You could put a milk crate or some other...
I have no photos either but I made the roosts so everyone could easily go as high as they wanted with plenty of room. With my chickens its not who is higher but who they are NEXT to. And I've found my chickens to be very, very "clicky", like teenage girls! They are all bantams...
OMG! My chickens do this too. The older ones (1 year old) jocky for postion and will step on their co-mates to get next to their favorite. Of course the one stepped on freaks out and falls off the roost. If someone doesn't like who they find themselves next to they will peck the offender...