Add Internal Dividers and Sink Shelf

What happens here

Cut additional vertical dividers from plywood. If initial cuts were too shallow (as encountered in the video), use scrap plywood pieces to extend their depth, gluing and pocket-holing these extensions. Install these vertical dividers using glue and pocket hole screws to delineate the drawer sections. Add a bottom shelf in the central sink compartment for additional storage and structural support.

Goal: Install the vertical dividers and a bottom shelf within the cabinet carcass to create compartments for drawers and define the sink area, addressing any material shortages with scrap wood.