For pickup mounting rings, I've made a simple template out of that clear plastic that my sperzels come in.
I marked out the mount rings, onto the plastic and just needle punched, dead centre of each hole.
When it's put on the body can see where it's lined up / positioned, because it's see-though :doh:
Tape, mark the holes, then drill.
Wax the screws and screw them in .... done :icon_biggrin: