I'm using a left and right single base unit on each side of the 2-door base unit under a six foot window in the garage and together they makes a good work surface.  I'm using 3 of the storage cabinets with toppers on one side of these 3-pieces and 2 of the storage cabinets with toppers on the other side.  I have never had such great storage in my garage and looks very professional.  To get all the pieces to fit tight against each other, it was necessary to counter-sink the mounting screws on the sides for a flush fit.