I am in the process of planning, building a nest box for my new coop. My JG isn't laying yet, but when she does I assume she will need a bigger box than my other 7 hens. (See signature for breeds). Can I build just one big box and the rest standard size, or should they all be the same size? They'll all probably end up using the same box anyway. I can either build one large and two smaller boxes, or two overly large. I have about 43" (i can use less space but not more) width wise to work in.