I'm probably too anal about it, but when I drill panels for folks I
start with a center punch, then progress up through 5 bit sizes to
keep the amount of metal being removed at any one time to a minimum.
That way I don't have to tape the front.
When drilling MiniWave LED rows, I cheat - I had a steel template
made that I can just clamp over the panel to ensure that the holes
are lined up.
Moe
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When I was drilling my Miniwave panel, I couldn't center the punch on
the light bar holes. The LED holes were too small to see what I was
doing.
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