I have an 8 x 10 stall in my small barn that I'm making into a chicken coop. I live in Maine where winters can be pretty brutal so the chickens would be inside for the winter months. I know the rule is 4sf/per LF however my math skills are not the greatest (except for chicken math!). That being said...how many LF brahmas could I put into the 8 x 10 coop & have them happy/healthy? There will be an outdoor run for when the weather permits.