Could the PJ "Time" have been modelled after a Cadillac Seville...
http://www.yachtforums.com/forums/pa...light=cadillac
Joking aside... a ski boat was modelled after a Corvette a few years ago. Along the same subject, the Corvette ZR-1 series used a block built by Mercruiser at one time.
As for a car maker venturing into yachting, Bugatti has some drawings on the table, but no takers so far. (best of my knowledge)