I also go the rear cab body mount removed and the holes drilled in the new location 12" back. I love removing rivets, they're so much fun!
The rest of the frame will get painted to match the front. Then I need to pick up some fasteners and bolt the mounts into place.
Aftermath of the process.....Nice little pile of frame crud/dirt, wire wheel wires, and cut off wheel and sanding disc material. Miller Lite can gave it perspective.