[*Cobber*]

The neighbors will be happy when the second level goes on.

Just paint F off on the wall facing the neighbour, I done this when I replaced a fence at our house in QLD and the neighbour refused to pay half of the cost. It was my fence and I painted what I wanted onto the back of it. It's still on there as the fence is on my property not the boundary line and they cant touch it. They tried growing some bushes in front of it but some weed killer must have seeped through from my side. They have since offered to pay half but I refused to accept it unless they also paid to move the fence to the boundary line.
I hate suburban neighbours and their petty whinging we now live on a property in the West with our closest neighbour 200mt away which is still too close for my liking.