Feed-sack Fencing

That is an interesting use of your old feed sacks. I have a bunch of them sitting around as our recycle place does not take them. You could make your set up a lot safer just by adding a roof of some type. Even chicken wire would make it safer than leaving it open! And I am NOT a proponent of using chicken wire! Hardware cloth would be even better.
I like how you suggest ways to improve in your article, like when you suggest making it 2 sacks tall.

I could see how this type of fencing might work for chicks but can't see how this would keep full grown birds within. Mine would easily go right over the top of the feed sacks. Also, it doesn't appear sturdy enough to keep a dog or other predator from getting to the birds.