M:Tron Magnet Factory
This manufacturing facility on M:Tron Corporation's remote home world manufactures the magnet boxes that the brave M:Tron astronauts use to harvest trans-neon-green elements. Built over 2 years, this model took an estimated 3,000 hours to create. The base is 40 x 60 inches, or 128 x 192 studs. I estimate that it contains about 100,000 pieces.
This model was first revealed at Brickfair Virginia, 2014.