This is what Ive come up with as best use of loft space. would plan boxes for 30 cocks and hens, racing roundabout so sliding door between cocks and hens sections. Infact sliding doors between all sections for flexibility and to let hens use the closest yb section to give more room at start of season but as hen numbers dwindle and ybs increase then it will become yb section. Any advice, better ideas. All thoughts appreciated