Yeah most places have rules like this for zoning! They usually are not enforced unless some one important or the County decides it wants the land for something else.
I, of course, believe that's the main purpose for making them in the first place.
As the Government grows in size so does it's control over everything, always to the detriment of the "middle class" people.
Glad you guys have managed to come up with an alternative.
When I lived in KC about a million years ago, it seems, the city was very cooperative towards Model Airplane Flying, and actually supported it in several places around the City.
Fortunately in Tucson we enjoy that kind of relationship with the City Government but we're always aware of the possibility of change!!!
Randy Cuberly