Update: tried the holes, needed much bigger than 2x3.25 (my tiniest legbar couldn’t fit through,) so they are more around 3”x4.5” (my Australorp and OE, the biggest, could juuuust get through that size.)
I put one on each side of their space and one in the middle. I have them under the coop (it is 2.5ft high, and 8x8, so plenty of space).
I brought my crazy broody in first. She’s a SF who’s not quite right. She has been calling them over to the screen to feed them, and goes in to bed early and tries to call the chicks in. She sleeps in the nest box next to the dog crate until dark when I move her on the roost. They did great with her, she was feeding them and cooing at them. Brought in 3 more hens, one at a time, and aside from one warning peck from my SE when one of the babies was eating off of broody’s beak, they had no issues. Until broody went batty. There is one whitish chick, and broody went crazy chasing him/her. Two other hens followed. I pushed them out of the way and the little one ran through the safety hole. After watching for another 45 minutes, everything seemed fine again. I moved all the hen food out into the run extension to avoid any food battles if the littles tried to eat their food.
I covered up the holes and came inside. I *think* they will be fine, but I’m worried about the hens hanging up on one and pinning it against the fencing if they get too far from their area. Thoughts? Am I worrying too much? I will definitely keep the doors closed when I’m not home, but I’d like to keep the doors open during the day when I’m here (most days except for errands or appointments until school starts).