INSTALL THE BASE CABINETS
Begin by making the seatboard that tops the refrigerator cabinet. Cut a piece of medium density fiberboard (MDF) so it is 1" wider than the cabinet and a couple of inches longer front-to-back (make it about 26" if using a 24" cabinet as shown here). Mount a piloted ogee or roundover bit (or other profiling bit of your choice) into your router and shape the front and side edges (step 1). You’ll probably get a little bit of blow-out at the back edge, which is why it’s recommended that you make the workpiece a couple of inches too long. Once you’ve routed the profiles, trim the back edge so the front overhangs the cabinet by 1". Coat all faces and edges with primer and at least two coats of paint.
Attach the seatboard with screws driven through the mounting strips on the cabinet top and into the underside of the seatboard. The back edge of the seatboard should be flush with the back edge of the cabinet and the overhang should be equal on the sides. Since this cabinet is small, it might be best to clamp the blank in location on the cabinet, then turn the cabinet on its back so you can access the fastener locations more easily (step 2).
Install the cabinet in the project location. Baseboard and any other obstructions should be removed from the project area. Slip shims below and behind the cabinet as needed to make sure it is level and plumb. Attach the cabinet to the wall by driving 2" wallboard screws through the cabinet back at wall stud locations (step 3).