Quoted from dothedoo:
I would compare with the old playfield and cut holes as necessary.
That is what I did. I kept the 555's in mine (Fireball II), but I did lay down new braid. I didn't know what I was doing, but was blessed with having two beat up old play fields to use as an example. Made life much easier. Even using the old stuff (lights in particular), I have only had to replace three lamp sockets. They are old sockets (40 years) and as they need replacing, I may swap out to 44 sockets.
The old harness was in pretty good shape, considering what this game had been through. It did not have a good life.