Marble Run mechanical puzzle (Bernardo & Iowa, Sunnyvale)

Manufactured by Rokr.
About 95% completed.
It's composed of two individual puzzles Marble Spaceport (LGC01), Marble Night City (LGA01) and a connector Marble Run Link Pack (LG01).
I initially put together the two puzzles separately, then decided to combine them using the link pack, but ran out of patience and stopped very close to completion.
Each individual puzzle and the two combined cycle several steel ball through various paths using either the crank or an electric motor.
If interested, you can just use it as a decorative piece, try to finalize it, or remove the connector piece and go back to the two original individual puzzles.
There are lots of videos online of the assembly process and of the completed, running puzzle.
I'm giving away everything: the puzzle in its current state and the original boxes with the documentation, remaining and spare pieces, tools, etc.