Remember the movie 'Contact' where the world joined forces to make the 'Machine' whose construction plans were beamed down to us from advanced civilizations out in the universe? And how that crazy guy messed things up during a test and the Machine spun out of control and was destroyed?
And then they revealed that they had built a second one in Japan! Wouldn't it be awesome that while this 1/4 scaled gigafactory was being built in Nevada, another GIGAFACTORY 4 times as large was being built somewhere else, totally top secret!?!
My vote would be Trinity Site in New Mexico, area of historically concentrated energy production.
Hey, that's MY favorite movie! I think the line was something like "rule number 1 of government projects: Why build one when you can build two for twice the price?!". This is not a government project Cattledog, but it would be pretty cool.