I have a feeling that they haven't started the lift hill simply due to the fact that they haven't finished the station....The track that returns to the station isn't even complete so why would they finish the lift hill? This might explain why the crane is gone. It's probably going to take a while to finish the station to their liking and I wouldn't expect the crane to be back around the end of April or the beginning of May to finish this bad boy up...
The track that would be returning to the station not complete