They have worked here for 8 years.
The perch in front of the nests was a 2x2, but the brahmas had trouble navigating it.
Switching it out to a 2x4 helped a great deal.
Here's some tips about heights:
https://www.backyardchickens.com/articles/coop-stack-up-how-high-stuff-works-well.73427/
I made ramps for some bumbling brahma's in the first flock.