https://www.cnbc.com/2018/06/30/can-elon-musk-and-tesla-reinvent-the-way-cars-are-made.html > Just outside the north wing of Tesla’s sprawling electric-car plant here, an unusual structure has taken shape in the last few weeks: a tent, about 50 feet high and several hundred feet long, its taut gray canvas membrane supported by aluminum columns. > Its purpose is as notable as its hasty construction. The semi-permanent structure houses a third assembly line — part of a desperate effort to speed up production of the Model 3, the car that Elon Musk, Tesla’s chief executive, has said is critical to the company’s financial health and immediate future.