Lemme get this straight. Your sole purpose in building these nests is to find out who is laying and who is not? Perhaps you wanna find out who is laying which egg? If all you wanna do is find out who is laying and who isn`t, there is a much simpler and easier way. Just feel the bones under their vent. A full size hen, like the ones pictured, will have enough space between the bones to lay 3 fingertips in there. Pullets somewhat less room and bantams even less. Easiest way is to pick them off the roost at night. Now, if it`s who is laying which egg, then all ya gotta do is pen the hens alone for a day or so. Maybe you have another reason, or just like creating things for your girls. Enlighten me..........Pop