It's been about a month since I started integrating the chicks, of which the last 3+ weeks they have been mingling freely with the hens without any dividers. There are one or two hens that like to chase the chicks around and harass them occasionally, but usually without making contact, so nothing to worry about. Most of the time they ignore them. The chicks avoid the hens, but my space is big and varied enough that they can hang out and have stuff to do without being close to them. The three chicks are inseparable, always doing everything together, and if one gets separated for some reason, she hauls a$$ and flies if she has to, but gets back to her sisters right away

The former broody is the most tolerant of them (probably because she had chicks recently?) so they allow themselves to get pretty close to her, but that's about it. Overall, the chicks look happy. I'm very happy with how smoothly that went!
One part of integration I have not done yet is the coop... They know the coop and spend time in the coop, and like climbing on everything and exploring, but they still sleep in the brooder in the house. With the exception of blue foot's butt, they are fully feathered, and it's hot outside, so I'm not worried about heat, but I'm still nervous about leaving them in a confined space with the hens. I might have missed my window of opportunity for an escape door, if I were to section part of the coop off. I tried that last week, and I can't find a size that's big enough for the chicks to fit through, but not so big that my smallest hen cannot. Also, the bigger hens try to squeeze their giant butts through as well, and get stuck

So maybe that's not gonna work... The chicks have a roost in their brooder, but don't use it. I made a huddle box/table for them in the coop, but they don't seem interested. They like playing on the big roosts, and can get up there no problem. I have 3 roosts - the top one where the hens sleep is 4' off the ground, the middle one is about 2.5' off the ground, and I have a baby roost less than a foot off the ground. They are all in the same part of the coop though, in a stepped/ladder formation. I was thinking they'd all sleep there, with the main flock on the top roost and the chicks either on the middle or on the bottom roost, but they might be too afraid of the hens to sleep in that part of the coop at all. So I'm thinking of making a new roost on the other side of the coop for them. And maybe setting the auto door to open really really really early, so that everybody can go out as soon as they wake up and not spend any time closed up in the coop. One of my hens won't let the chicks come within 2 feet of her (doesn't peck them, just chases them and growls menacingly). They are terrified of her, and run at the sight of her. So I'm worried that if they find themselves confined in the same space with her, they'd freak out and hurt themselves flying up at the walls

The coop is 5x7 and I have 5 hens and the 3 chicks, so it's not small, but still. What would you guys recommend I do? I like having them in the house, and they do still spend the whole day outside, they only sleep in our house at night, but I should probably get them used to the coop soon.
Here's the baby roost at the bottom of the roosting area (the roosts are staggered, so nobody poops on anybody's back).
And the two higher roosts:
The chicks also like jumping up on the nesting box. I have never ever seen the hens up on the nesting box, for some reason. None of them are good or willing jumpers/fliers so I'm thinking if the chicks go up to escape, the hens likely won't follow.