Nelson Marek 43
I think there is some confusion here. As far as I know, there is a Morgan 43 which is an aft cabin-center cockpit boat that is still being constructed by Catalina-Morgan. There was a Morgan built, Nelson-Merek designed 45 foot, IOR rule based, race boat that was also produced as performance cruiser. These are referred to as Morgan N/M 45''s. There was also a Nelson-Merek designed 43 footer than was not built by Morgan and which was an aft cockpit boat but which was not constructed by Morgan.
All of that said, I am not sure which one is the boat in question.