I would be careful. rabbits and chickens are mortal enemies. once that rabbit gets a whiff of the chickens he's gonna be out for blood. next time you open the cage the bunnies will run out and start ripping the chickens to pieces. it's a terrible sight.I'm curious your reaction to putting a mini size rabbit or 2 in a chicken coop with 4 silkies.
My reason is so rabbit could have shared heat lamp, shared heated water, better shelter in winter than in my barn, better daylight than in the barn, and free access to fenced area outdoors when the weather is decent.
There is also a cat in the coop, but she is still young and not yet loose in the coop - maybe never. She is in a kennel (with litterbox, etc) in the coop overnight only.
Neither chickens nor rabbits for food production.
Bad idea? No big deal?