Art, I haven't read your entire post, but briefly, the Andrea Doria did have an automobile garage, and the Norseman was in it (rather than a cargo hold, for example), so it's possible that it was merely driven in there - assuming that it was complete and operable when shipped. I did read somewhere that it was to be a fully operational car and not a "push-mobile"... brings up the question of whether the entire car, including drivetrain, was assembled by Ghia, which leads to questions like, did Chrysler ship a chassis with engine & running gear over there, who did what, was it running and drivable when it left Italy, or was the running gear to be installed later over here, etc!
I gotta contact Collectible Automobile!
I wonder what kind of info is still available on the car from Chrysler...
Special Interest Auto's Magazine actually ran a picture or two of the Norseman, taken before the car left Ghia in Italy, it sure appeared to be a complete car at that time. And yes, Andrea Doria did have a garage in her hold, but likely also had a more conventional cargo hold--so both notions of transporting a car via this ship could well be true.