Gather the backer, door plate, door frame, and hook plugs

(some designs may vary but the assembly is the same)

Glue the Door plates to the backer making sure the sides and bottom are lines up with each other. 

Glue the Door frame to the previous step also making sure the sides and bottom are lines up with each other. 

Glue in hook plugs to the back making sure that they are as parallel as possible.