I had seen it, but it's bigger than any one part of my yard, and might be 1/4 the size of my manufactured home!
>> for smaller hoop tunnels, I think you can zigzag a cord over the top
I like the idea of zig-zag cord, but hope to have somewhat stiff (though thin) bamboo culms to provide support between hoops. My hoop tunnel would probnably be around knee-high.
Thanks for the cord idea!