Both add strategies to add warmth, and, thus, reduce the food needs.
http://www.youtube.com/watch?v=CCyRNA4p3Xc
Interesting methods. I like the natural built shelter. I don't know how well it would do with predators, but it would be easy to find any middle of the day eggs that would be laid in a free range yard. What I know of that is simply from observing others. The chickens I raised never got to the egg laying stage. [hungry]
Paul, I don't know if you saw this one:
http://countryplans.com/smf/index.php?topic=11831.msg152038#msg152038
It looks like one you shot.