My chickens like to hang out in the rabbit barn more than their coop since I added 10 more chickens to my flock. I need a little advice on how to set up some new nesting boxes and roost inside the rabbit barn. The barn is 12x15. The back wall is all rabbit cages. The front wall has a 3ft door at one end and a single 2ft wide rabbit cage for my buck. That leaves a 10ft space to fit a roost and nesting boxes that will accommodate 20 chickens.