I've used blind corner pullout storage units in the past and been disappointed by the amount of space that's still unused in the blind corner. I addressed this issue with a pair of blind corner cabinets in a recent project. Hidden in the corner behind the commercial pullout unit is a sub-cabinet with four drawers on full-extension drawer slides. This includes HDPE wheels mounted on 1/4" steel axles in the base which straddle the tracks for the commercial unit. It has HDPE rub strips on the front and back edges of the top to allow the unit to roll easily even though it's a tight fit front-to-back to provide stability when the drawers are extended. The side of the unit is finished to look like the interior of the blind corner cabinet so that it's essentially invisible in the closed position. It had to be lowered into the blind corner cabinet after the commercial unit was installed but obviously before the counter top was installed.