Our 21SS Roo came with a tilt drawer @ the very top kitchen drawer stack. After pulling the drawers to see what kind of space was behind this area it was apparent that a sizeable drawaer could be fitted here - working around the sink drain. You will have four screw holes to fill where the hinges are removed from the bottom of drawer front on the cabinet face and a small stile spacer to remove that catches the plastic tilt tray.
In the 1st picture you can see the lighter colored plywood that I tied into the existing supports. The holes needing filled & the new drawer slides installed above are in pic #2. Pic #3 is the new drawer - with a jog in the back to take advantage of the space running along side of the sink drain. This area will be useful for longer untinsels. The drawer is approx. 12" on short side & 16" deep on the long side. Needless to say wife is much happier with new drawer!