8" wide....so about 8" tall too?
They look like a great nest bank....but.....
Nests are best sized at least 12" x 12" x 12"...I like to go 14" x 14" x 14-16" tall.
I'd rethink your plans before going further.
I didn't see any where u said about measurements I need a new coop because sic de I built my coop I didn't have as many chickens so now I am thinking of like an 8x10 but idk how big to go so now me and my dad might have to build another coop thanks looks nice are u going to be using straw or something on the floor