Short answers, pulled from the story.
The Michoud Assembly Facility is an 832-acre industrial complex owned by NASA, located in New Orleans East, Louisiana. It is organizationally part of NASA's Marshall Space Flight Center and serves as a multi-tenant manufacturing site for aerospace vehicles and components.
Michoud has been used to build the S-I and S-IB first stages of the Saturn I and Saturn IB rockets, the S-IC first stage of the Saturn V, the Space Shuttle external tanks, and currently the core stage of the Space Launch System. The first stage of the last-constructed Saturn V, SA-515, remains at the facility.
The facility was originally constructed in 1940 by the Higgins-Tucker division of Higgins Industries, directed by Andrew Jackson Higgins, on behalf of the United States government for wartime production of plywood C-76 cargo planes and Higgins Boat landing craft. The project cost $180 million, equivalent to approximately $2.8 billion in 2018 dollars.
Thirty-eight NASA and Lockheed Martin employees stayed behind during Hurricane Katrina to operate the facility's pumps, preventing the complex from flooding. They pumped more than one billion gallons of water from the site and were each awarded the NASA Exceptional Bravery Medal.
On the 24th of May 1988, TACA Flight 110, a Boeing 737-300, lost power in both engines during a thunderstorm and made an emergency landing on a grassy levee within the Michoud grounds. The aircraft was taken inside the facility for engine replacement and later departed using Saturn Boulevard, the facility's former runway.
The main manufacturing building's ceiling height limitation of 12 meters ruled out construction of the larger Saturn C-8 direct-ascent vehicle. This constraint was one of the major reasons NASA chose the smaller C-5 configuration, later renamed the Saturn V, over the originally planned C-8.