We claim the ornamental design for a pre-fabricated building part for a skylight window, as shown and described.
FIG. 1 is a perspective view taken from the rear, bottom and left side of a pre-fabricated building part for a skylight window showing our design;
FIG. 2 is a perspective view taken from the front, bottom and left side of the pre-fabricated building part for a skylight window of FIG. 1;
FIG. 3 is a left side elevation of the pre-fabricated building part for a skylight window of FIG. 1, generally inverted from its orientation in FIG. 1;
FIG. 4 is a rear elevation of the pre-fabricated building part for a skylight window of FIG. 1;
FIG. 5 is a front elevation of the pre-fabricated building part for a skylight window of FIG. 1;
FIG. 6 is a top plan view of the pre-fabricated building part for a skylight window of FIG. 1; and,
FIG. 7 is a bottom plan view of the pre-fabricated building part for a skylight window of FIG. 1.