If you have illustrator or Corel Draw, photograph the Pickups and then import the image into the program. Then scale it up to full size. I do this by drawing a box over the image that fits something of known size.
i.e. you can measure how far apart the screw holes are so measure them and draw the box to touch the screw holes as measured.
When you change the size of the box to full size, it will scale by a % and that will be reported back to you. Copy this % and paste into the scale for the image x and y axis. The image is now life size. Delete the box you drew and then draw a life size image by tracing the outline of the pickup in the image.
This is then priunted out on any standard printer and you can use it as the cutline on some MDF - one template ready to go!