My 40 was painted by Just Driven , a custom shop in the LA area. Nice video on you tube and on their web page. Search GT 40 replica inspiration for cancer survivors. They reworked/painted it before I bought it so I have no idea of price. Paint work is quite nice.
From my time living in So. Cal, I believe that most of the chrome and metal plating shops, along with paint and body shops, have been forced out of California by the overly strict regulations by the SCAQD and EPA.