What do we, as a family, get up to when we’re technically “done” with the game but want to wait out the production of Phase 4 products into the Space Elevator to fully round out the game save?

Well… this:

If you want to skip ahead to the really silly parts, go to ~2:15 (h:mm) to see Spud build The Ladder of Babel, and about ten minutes later he discovered the fun to be had with driving vehicles over jump pads and at that point pandemonium ensued… featuring airborne factory carts.