@MikeTodd
Yay!! Wonderful
You will need to put some kind of top - just some screen of some kind - over the top of the little one's side. Both the larger ones and the littles will jump up on that and be on the other side. The older ones have the potential to seriously hurt your little chicks.
ETA:
It looks like you have a dirt floor. I haven't followed all the details of your build so if you've done this please forgive my "ignorance" on the matter
...
You will want to put some kind of wire barrier like hardware cloth for example, as an apron around the base of your coop on the outdoor side. It would run up the side of the coop a bit then down to the ground (folks often bury it a few inches underground) then running out away from the coop. (Think an "L" shape). This keeps predators from digging underneath the side of your walls and getting into the coop at night to take chickens.
Yay!! Wonderful

You will need to put some kind of top - just some screen of some kind - over the top of the little one's side. Both the larger ones and the littles will jump up on that and be on the other side. The older ones have the potential to seriously hurt your little chicks.
ETA:
It looks like you have a dirt floor. I haven't followed all the details of your build so if you've done this please forgive my "ignorance" on the matter

You will want to put some kind of wire barrier like hardware cloth for example, as an apron around the base of your coop on the outdoor side. It would run up the side of the coop a bit then down to the ground (folks often bury it a few inches underground) then running out away from the coop. (Think an "L" shape). This keeps predators from digging underneath the side of your walls and getting into the coop at night to take chickens.
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