Remove the drawers from the cabinet and set aside. Using an electric screwdriver, remove the screws connecting the cabinet to the wall. Carefully pull the cabinet out of the nook.
The large base cabinet is actually three cabinets held together by screws. Use an electric screwdriver to unscrew the cabinet pieces from each other. Use a hammer and chisel to remove the toe kick so that the three pieces can come apart.
To create a secret storage drawer hidden in the cabinet's toe kick, turn the cabinet upside down and cut a notch in the toe kick the desired width for the drawer. Since the toe kick isn't tall enough to house a useful drawer, Karl built a box-shaped extension for the toe-kick and attached it to the toe kick with screws and small pieces of plywood. He notched this piece as well, creating a space for a drawer.
Build a simple plywood drawer – basically a plywood box without a top – to fit inside the toe kick opening. Install with standard drawer slides and finish as desired.
Draw a level line even with the top of the cabinet, extending around the nook. Cut a small wooden ledger and screw it to the studs so with the top edge on the line. This will support the part of the heavy granite counter that's not supported by the cabinet.