[aerohead]

Seems like any potential gain at the nose would be lost due to the open, walk-around deck. Without a 'roof' on the boat, there's nothing but turbulence up there.
As the boat goes on plane, inclining, separation increases and the situation only worsens.
And that folded overhead sunshade makes a pretty good impersonation of a parachute.
When Rumpler enclosed his 1921 open touring car, converting it to a 1924, closed car limousine, the drag dropped by about half.
Even 'cigarette' boats suffer on plane. The upper body needs to be designed to be streamlined when on plane, not parked at the dock.