So I downloaded the autocad drawing of the C172 panel from SimKits website in the downloads section. I printed that off and taped it to my 1/4" MDF panel. Would have been better if I used some spray adhesive and glued it down. I then used 3" and 2" hole saws in a drill and cut out each gauge hole by hand. Took probably an hour to do all of them. I spent a lot of time trying to find various cups and funnels to use their top rings as bezels and couldn't find anything that worked quite right. Earlier this summer when I was flying a real Cessna 172, I noticed that the round gauges don't have any exposed bezels. How I didn't notice that before, I don't know. But I got the acrylic panels made as shown above and I just painted the inside of the rings black. This is almost exactly what it would look like in the real plane, although they would be beveled inward in the real plane. Can't do that with a 2d laser cut, but who cares? It's close enough.