WaPo:
To speed up car production, Musk said Tesla is now testing an unconventional alternative, raising a giant tent structure on the Fremont grounds and building a new factory line inside from warehouse scrap.
The “pretty sweet” tent, Musk said on Twitter, is “more comfortable” and “way better” than the factory building, and Musk on Twitter congratulated the team for building an “entire new general assembly line in 3 weeks (with) minimal resources.”
Needed another general assembly line to reach 5k/week Model 3 production. A new building was impossible, so we built a giant tent in 2 weeks. Tesla team kfa!! Gah, love them so much ♥️🚘💫— Elon Musk (@elonmusk) June 19, 2018