The product is well designed, however the instructions could use some written explanations. Build it close to where you're going to place it, because it's heavy once it's together. Take your time and review the directions BEFORE you start.  There are no extra parts -- I used every screw, clip, fastener and nut.   Be very careful not to over tighten any of the screws as they will strip out the particleboard.  I also wouldn't recommend using an electric screw driver.  I took my time and finished it in 2 1/2 hours.