Here's a preliminary design for a 141' trideck motoryacht. The yacht was to built with a steel hull and aluminum superstructure. Power was to be supplied by twin Caterpillar 3508B engines rated at 825hp each for a top speed of 14 knots. Range was to be 6,000 nautical miles.
A couple of points about the arrangement. Please note the owner's stateroom/suite located on the main deck forward and his private office which opens to the sea.