The unit is sturdy and has lots of flexibility.  If you leave off the small slats in the tall unit, you have the flexibility to put the tall unit on the right.  Of, if you are a handy person, you can drill holes and insert the legs on the other side.  And, there is the flexibility to make the unit longer or shorter, depending on the space available.  Everytime I put together furniture that comes in boxes I am amazed at the engineering and thought that goes into making it easy to assemble and how to configure the pieces in the box to get the most out of the space.  Although it took some time to put the unit together, it was relatively easy, made easier with an power screwdriver.  The drawers slide nicely and fit well.  I could not be more pleased.