Step 9 – Attach the Ends of the Ledge
Place the assembled Frame and Border face up on the work surface. Make a mark on the Border that's two inches above the bottom edge of the assembly. Position the ledge's end pieces against the border, below the mark, and with their mitered ends facing upward. Apply wood glue to the inside edge of the molding, and then nail it into place using a nail gun a 1¼-inch finish nails.