Wow! That's very cool, and very interesting! (not to mention huge at 12 feet opened up!)
A trailered "temporary" setup beat a local issue I ran into in my former hometown. The town said, "too close to propertly lines to mount permanantly" when I lived in a storefront apartment, so a trailer did the trick with a tall pole and gave me full view! When I was told, "License the trailer"...I said, "its a specific purpose trailer" (and this got us past the licensing needs, though the trailer never moved an inch after it was put in place.) Later, a fence around the trailer hid the wheels. Stayed that way nearly 10 years! Concrete on an adapted and shortened dual axle boat trailer and 4 trailer jacks made the whole thing stable.