The ornamental design for a trellisstructure for a gaming apparatus, as shown and described.
FIG. 1 is a perspective view of a trellis structure for a gaming apparatus showing my new design;
FIG. 2 is a front elevation view thereof, the rear elevation being a mirror image;
FIG. 3 is a left side elevation thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a perspective view thereof, shown in environmental use;
FIG. 6 is a another perspective view thereof, shown in an additional environmental use; and,
FIG. 7 is a front elevation of FIG. 6, the rear elevation being a mirror image.
The broken lines showing of an additional pedestal structure and other gaming features in FIGS. 5-7 are shown for environmental purpose only and form no part of the claimed design.