I'm going to be up against the same issue.I have Silkies now and they are the sweetest most friendly,loving, happy, purring little girls. On April 11th (my hatch and ship date) I have coming 7 Barred Rock females and One "meal maker" meaning another production laying hen of surprise breed. it's given free from the hatchery so we can donate the eggs from her to the needy.(which we are excited to do)anyway that's 8 large size birds.I WILL have separate sleeping houses for the silkies and the Barred Rocks because they sleep very differently. Silkies sleep in nests and together on the ground of their house. The large birds roost to sleep. They could NOT sleep together because the big birds that perch to sleep would poop all over my little ones sleeping on the ground! so they will have different "houses" to sleep in. My hope was for them to share the run though. I just pray it works out. I do NOT want my little silkies hurt!! if I have to I will split the run. But I hope I don't have to.