spraying a coat of intercoat clear down over your base will keep you from going through to your basecoat if you're light with the razor.
I make a checker pattern on the computer and then cut it with my vinyl cutter. Then you take out every other square...apply it to your surface and airbrush in your pattern. See if a local sign company will aid you in this process.
Laying down a ton of tape and drawing/cutting out your pattern works, but you have to be very accurate with your square sizes.