captain crow wrote:
The C, two O's, and A (using chopped up 1's) could have been from the underside saucer "NCC-1701" decals since they're about the same size font as "U.S.S. ENTERPRISE" and the two L's could have been made from E's from Enterprise.
The link I posted before shows the decals that originally came with the kit. They could indeed have used the C and the O from the registry, and the A and L could possibly have been made how you describe. Of course, that would mean that multiple kits would had to have been bought to get all the letters, but that's a possibility too.