My biggest problem putting this together was securing the top piece and the front top piece together.  Trying to get the cam locks in the front piece (where the doors fit under) was practically impossible - the cam locks couldn't get the bolt.. the top was bowed in the middle.  I finally flipped the piece upside down and managed to get the cam locks to secure the bolts... but it was THE MOST FRUSTRATING THING about putting this together before I thought of flipping it upside down.  The rest of the assembly was simple and the piece is solid.  Looks great.