ajsyrup,
I would first mask of the entire dash, do my layout then use a piloted carbide hole saw. With the hole saw start on the back side first but don't go through all the way, just before you got through turn it around and finish the hole from the front side. this will keep the fibers from splintering, then bring it to size with a drum sander.
Mike that dash looks killer!!! I wonder where you got it.
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