I love your fencing- where did you find 12 gauge wire fencing with the small holes? And how did you secure your netting to the building?
You can get 16 gauge 1" x 1" or 1" x 1/2" at Lowes, I was looking at it recently to re-do the windows on my coop building...
http://www.lowes.com/pd_52247-16418-840086_0__?productId=50029250
http://www.lowes.com/pd_52347-16418-840093_0__?productId=50029252
That or try a local livestock swap, around me there is always some cage builder there that also sells the heavy gauged tight mesh by the roll...