Connet the End Panel and Back End Panel, then screw them together on the Back End Panel.
Insert the Bottom Panel and the Top Panel into the grooves.
Position the another Back End Panel into the grooves, then screw them together.
Locate the another End Panel and screw it.
Screw the dowels into the Faceframe.
Position the Faceframe, then use screwdriver to lock the Casings.