I’ve always had a miserable time making humbucker routing templates, they are never perfect like the cnc-made ones that you can buy. I know, I should just buy one of them, but I love a good challenge!
I figured out a new way to make them that is near-perfect, think Tetris or Jenga, watch the video to find out.
You can download a PDF of the humbucker routing cavity template here. (right click and Save-As)