I seem to get into trouble here with this response but here goes. I always have. I raised 2 poults with a couple dozen hens and 2 roos. They were over a year old and it became mating season for the turkeys. My female turkey started going in the where the chickens were dusting and stomping them. Then I separated them. There is something called Blackhead that is fatal to turkeys. I called my agriculture department in our county offices to inquire about it. It's something in the soil and at this time my area is unaffected. Doesn't mean it will stay that way.Can turkeys live in the same coop with chickens!??
( it's a medium to larger coop)
As far as room, my hen would really peck anyone that would roost very close to her. Be sure you have adequate room for roosting and depending how large the turkeys get, they can break legs trying to jump down. Sorry my response isn't really helpful. sue