[GBC] Rise and Run

[Great Ball Pit]

Here's a simple one I've built recently.   It uses a fairly common drivetrain that runs beneath the module to drive some lift arms at both ends.  Power is taken off the main drive shaft using worm gears which drive 24T gears at both ends.  The steps down were inspired by Cadder's "Demon road" which can be seen in a few of the Brickvention videos out of Australia.