You have a very nice set up. And, it's good there has been so much visual contact between the hens and chicks. They (and you) will do fine. Keep us posted!
I tend to integrate on the early side. I've always let my broody hens raise the chicks in the main coop, and have found the chicks seem to get by quite well even though some get dumped by mama hen as young as 3 to 4 weeks old.
When I don't have the luxury of a broody hen, I go for a set up...