Boat superstructure

FIG. 1 is a top left front perspective of a boat superstructure showing our new design;

FIG. 2 is a top right rear perspective thereof;

FIG. 3 is a top right front perspective view thereof;

FIG. 4 is a top left rear perspective view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof; and,

FIG. 9 is top view thereof.

The broken lines represent portions of the boat superstructure and form no part of the claimed design.