Getting P4 back panel to insert into 7 slots for exact fit was not easy.  Had to push left bottom to install P5 panel. P4 still not completely flush, but acceptable.  Doors don't align. Right door P7 appears to be fine. Left door P8 won't align even at highest point.  Seems left door is not square at corners or something.  Will not hang unless I can get new doors.  Expensive for poor fitting pieces.