Question about roosts and poops trays

[Hokum Coco]

Hello. My husband is going to build our first coop and I have some questions about the roosts and poop trays.

I know the chickens need 12" of space per bird on the roost but if I need more than one roost, how far apart from one another do they need to be and how far does a roost need to be from the wall? About 1ft form each other and the wall.

What is the lowest and highest the roost can be off the ground? Mine can manage a 2ft jump up to the roost with no problem (Golden Comets)

About poop boards....

How far below the roost should they be? I have mine 3½ inches from the board.

Will the chickens jump onto this and then onto the roost or will they just go straight to the roost? I'm asking because I am wondering how we attach the poop board so that it is easy to take in and out for cleaning, but if the chickens are going to jump on it on their way up to the roost I need to make sure in they're attached in a way that that is safe for them.Mine always land on the roost.

What ways of attaching them do you like?

Thank you,
CJ

My roost over my poop boards is very similar to this photo.
POOP BOARDS are the "BEST" addition yet. Handles well over ½ of the poop in my set up keeps ammonia smell in check 3½" below roost excellent for catching eggs laid through the night (roost are in cups for easier removal and cleaning). I recently friction fit a piece of vinyl flooring over my poop board.it makes clean up even easier; Pop out; Scrap; Hose; Pop in.

Winter months even easier flex over compost bin DONE!

Easy peasy!.