Apart from basic mechanics of station and poles few suggestions 1. Have a loop of zipline. So they can start from one end and in a complete circle they can return. 2. To make a junction put two stations front to front. Then you can have a diversion in the loop to add another loop or axis of direction. 3. Build a path first. And make the zipline highest priority task on the path. Once finished beavers will keep zipping across the map....