It took about four hours from start to finish, but I took a couple of breaks, I measured and drilled and was meticulous when putting it together.  Came out beautifully.  On piece 14 place the two J2's on the bottom, the two J1's on the top of the two piece fourteen sliding doors.  Place the glass on 14.  Slide the glass down so the bottom of the glass meets the top of of J2.  Now proceed to step 11 to hold the glass in place.
Very solid piece.  Lots of screws hold it securely.  I would recommend it.