This is a 2 person job in order to get the door lined up before drilling the holes. I think it would have been easier to mount the hinges on the door frame before the door. Not sure. We put the hinges on the door first and as a result, the door had to be held in place when the drilling was done for the hinge attach point of the door hinge on the top of the door frame.
Note the back plate for riveting the top of the hinge through. It can be a challenge to get them into position because of the limited space. Make sure they are well reamed before trying to put the rivets through them in the door frame.
Door frame bracket on left, backplate for door hinge rivet points on right
lock slot on the front side. There is another one in the back.