Great idea on the tree branch with varying heights!! I am going to utilize this idea in the 6'x8' grow out run (hoping to have it within a few more weeks)..it will have a 2 ft and 4 ft roost bar but the branch will be great for when they transition from the lamped brooder stage! I can relate that many things about caring for these birds is tough on the back...despite only being 47..."This 'ol grey mare ain't what she used to be!"You're doing exactly the right thing ! I use a 300 gallon Rubbermaid stock waterer which is about 5 feet across as a brooder in my greenhouse. In it is is a very sturdy 3' long branch which has other branches from 4" to 2 feet.. All the chicks fly up and exercise their wings, so NO weak wings, and they all sleep up there once they don't need to be under the lights.
I also use Rubbermaid double walled storage boxes for the babies when they go outside. We cut doors and added ramps. The trick is to then get their tiny little minds in gear to go up the ramps to bed. I have no need for the gym. Lifting all those babies is great for the middle, but plays havoc on the back.