I'm contemplating make a chunnel from my coops run over to the garden. It would be much like I'm sure you've seen on the mother earth site and here where it would be portable or with gates/doors that I could move around the vegetable garden. Anyway, My question is about the height of the half circle fencing for the chunnel. What would you recommend at the center of the circle? Also, i see many people recommend 14 gauge....if this is only for a couple hours a day, would I get away with something cheaper for it?