Quoted from rkahr:I'm not sure what (if any) advantage the punches introduce compared to how you are tackling the work.
A little more research turned up this old thread: https://pinside.com/pinball/forum/topic/proper-way-to-drill-a-hole-in-petg-plastics
Follow the link in the thread for special plastic cutting bits to see a potential disadvantage to drilling - chipping the material. The drill bit seller advocates for their product but the thread points out punching to avoid risks of drilling the material. My plastic showed up in the mail today so I'm suddenly motivated to start building my pattern.
-Rob
-Visit http://www.kahr.us to get my Daughterboard that helps fix WPC pinball resets or my Pinball 2000 H+V video sync combiner kit