Hello, I am sure this questions has been asked a million times but I what is everybody using for their nesting box measurements? Also, I have drawn up a plan for my coop/run. In case its too hard to read, the total space for chickens run would be 12 x 3, the actual ENCLOSED part 4 x 3. Let me know if my dimensions are hard to understand on the bottom right corner. Thank yo so much for your help!