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To attach the solid drawer fronts to the drawer boxes, position a scrap piece of wood (a spacer block) on the bottom of the cabinet. This provides a consistent height for the first drawer front. Rest the first drawer front on this spacer, ensuring it's centered and aligned with the drawer box. Clamp it securely in place. Then, pull the drawer open from the back and attach the drawer front to the drawer box using screws from the inside. Repeat this process for all the lower drawer fronts, using spacers between each one for consistent gaps. For upper drawer fronts, use another spacer block to set the correct gap from the drawer below. Finally, attach the drawer handles or pulls to each drawer front.