Shelby is building a museum in Gardena at his old facility, but I'm not sure it has opened yet.
It is a short hop from LA to Las Vegas by air if you want to visit their main facility and do the whole tour. They have some nice stuff there. It's very close to the airport so just a cab ride, a visit and back on a plane to LA.
An easy one day trip (as long as you stay out of the casinos).