As far as the dedication plaque goes, I take it with a grain of salt. I don't believe the Enterprise was built in San Francisco, California either.
When I watched TOS, I always thought the Enterprise was built on the ground and was flown up. When I saw those cranes in the background of Starbase 11, I imagined that those were working docks for starships that needed major work. I guess it went hand in hand with watching Starblazers/Space Battleship Yamato
And Abrams Trek later on just added to it with ships built on the planet and even at a much larger size.