Sorry, I wasn't able to get pictures last night, but here is what the set up looks like! Basically the big chickies get free run of the backyard and coop, and the little chickies are in this 6'x10' run during the day, and we will let them out to free range with the big chickens while we are supervising. You can see how close they all are and have had this interaction for at least 3 weeks. No fights or attacks, but the head hen does want to charge the little ones due to what appears resource guarding like you said. I forgot to get a picture of their dog crate inside so I can get that too, but it's just a dog kennel with flock fresh bedding, a roosting bar and food and water, about 2'x4'. They are only in the kennel for about an hour right before going to bed. I tried to show my hand for spacing of the roosting bars in the coop. Perhaps I can reangle them somehow?