This is the first time I have posted here. I would like to thank everyone for all that you do on this site. I have learned a lot and continue to learn daily. I am currently building my chicken coop and am nearing completion. I am about to build my nests and install them. They will be external to keep more floor room inside. My question is this, the material I am using will cause my nest box to be 3' long. Should I divide the nests into 18" nest or should I leave it a full 3' long? Also I am stacking nests 2 high, how high should the first box be off the ground? Thank you all.