Skim Board Shelf

Step 3: Attach the back to the shelf

Using L brackets, attach the back of the shelf to the shelf.  This creates the stand alone shelf and back.  This step is optional because you could just attach the back to the wall somehow.  I chose this method to keep things simple and lined up.

For the very detail oriented only; I made sure to keep the shelf half approximately 1/4 inch off the wall to leave room for the back.  I also placed the back approximately 1/4 inch high to that it doesn't cover any part of the bottom.  That way the bottom exactly matches up with the top.