sorry. but i don't think theres any bug free way of doing that. especially with GUI. my mini idea was that you could make a unit (e.g. modify rifleman) and set his model as a gun (maybe import a konstrukt one). disable his movement and make a trigger so that every 1 sec of game or something, move him to the position of your zeppelin?? or center a region every 1 second of game onto zeppelin, move the unit to a point of the region.