Line up the center lines and marke the end of the notch for the hinge. Trim it out and attach hinge to door.
The clecoes on the door hold it up so I remover the hinge from the door, attached it to the floor and drilled through the door hing holes into the floor. I then opened those holes in the floor so the clecoes would just go through the floor. That area is gonna get cut out later but wanted it there for the strength right now.