Step 3: Cabinets
Placing all the frames against the wall, and use shims to get the cabinet top shelves to line up and look straight. Once you have them lined up, use a few 1 1/4" drywall screws to connect the frames together on the sides so they don't shift. Pre-drill and counter-sink these holes too. We found white plugs to put in the counter-sunk holes. Wood putty and paint would probably work too - might not match the melamine finish exactly, but you really wouldn't notice once the shelves are in and filled with books.