Highest roost is roughly 5 inches away from the wall. That’s where the hen sleeps. Lower roost has an open space behind it, with a wall partly coming down. I’d say it’s also placed roughy 5 inches into the roofing area.
The roosts are about 8 inches apart, and the highest roost is about 16 inches above the lowest roost.
If the issue is that it’s too small, I could encourage them to roost on the other perches outside the nesting area, in the “run” area of the garage coop. There is essentially a dropping board filled with wood shavings below these perches.
Also, I measured the run, and it’s roughly 120 square feet.