Remember that the suggestions one here are guidelines, not absolute laws of nature. Most of us violate some of the guidelines and do OK. The guidelines do not guarantee you will be successful if you follow them, nor do they guarantee failure if you violate one. If you follow the guidelines...
Uhoh!
Does the 8sq ft per bird for coop apply to Bantams? Aren't Bantams like 1-2lbs a piece?
I will have 1 Jersey Giant (Not sure if that is standard?), and then 4 standards, and 8 bantams... I am building an 8x8 coop with a 10 x 12 run... is that too small? OH NO!