Work goes on on the panel. I drill all the nuplates holes, drill all the holes to final size and countersink where needed (almost 100 holes).
I then install the round instruments, despite having made a template to drill the srew holes I have to ovalize some to get a nice fit.
The picture shows also that I needed to use metric screws for the instruments on the right, and "inch" screw for the one on left.



Then I sand all the edges and deburr all the holes.