You don't need to build a shipyard on the west coast to avoid a Panama Canal transit for a Pacific deployment. When the Ronald Reagan sailed from the east coast to San Diego (its home port) it went around South America.
USS RONALD REAGAN (CVN 76), at sea Ronald Reagan Strike Group (RGNSG), consisting of Commander, Cruiser Destroyer Group ONE (CCDG1), the Navys newest nuclear-powered aircraft carrier, USS Ronald Reagan (CVN 76), and Carrier Air Wing ELEVEN (CVW 11), departed Naval Station Norfolk, Va., May 27 for a two-month transit around South America en route to the ships new homeport at Naval Base Coronado, Calif."
http://www.reagan.navy.mil/04-016.htm
They should reasonably amend the process right now to see 4-6 hulls with same machinery/powerplant set in motion..
I'm sure if you give the navy a personal check for $20 billion, they would be happy to start building a half - dozen aircraft carriers all at the same time. Otherwise, money is a problem.