Our chicken pen, is big 40 feet long and 15 wide, (it was originally a dog pen lol). The fence is rabbit fence, with chicken wire along the bottom, and the pen is all grass. The "coop" is a big dog house (my dad built it, (carpenter), they roost on the top rail of the pen at night.
I raised rabbits when I was younger, and a friend has 2 males (used to living together and friendly) for sale, I was thinking about getting them, but I really don't wanna put them in a cage.
I read that if rabbits eat chicken feed and vis versa it is no problem.. I feed my chickens scratch grains- not pellets.