Iīve posted this crane at the "New Levels" section before I saw this topic. Itīs a lot of fun to build towers, cranes and the like.
This crane has a swinging "heavy" beam attached to the "hook": Not one link will break, even if you start the movement much higher. Only the beam will break free of the cable.
It took a while to get this thing balanced. And it costs more than 600.000. uuh!

two interesting observations/questions:
- It is impossible to destroy a tower, or this crane, in a way to let it fall with itīs full lenght. It always breaks down near its foundations. Is this so with real buildings, too?
- If you combine heavy and light steel, sometimes a whole section of the tower explodes very forcefully when popping into virtual reality. To change only one of several beams into the other material will help. Did anyone notice this strange behavior, too? Looks very unrealistic to me.