With that many "coops", you can only let one free range at a time; mix them, and the roosters will fight and kill each other, i.e., these groups will have to remain in their pen almost 24/7. You're only wanting eggs for incubating from each group, so why would you want more than four hens (or fewer) and one rooster per pen; those four will provide two dozen eggs per week for incubation purposes. If you plan to keep more than four or five chickens in a 100 square feet 24/7, plan on having a lot of dirty, stinking coops.
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