Full-size birds require 4 sq ft/bird minimum. Less is likely to promote fighting, poor health and reduced egg-laying. Most posts in BYC speak poorly of prefab kits, especially if from Red China. One alternative is to look for a play house that someone wants rid of due to moving or kids now too old, etc. They look great, are not that hard to convert, and will work well for a small flock. Another one is an extra-large dog kennel or even two that could be co-joined.