My approach is a bit reversed, different problem;
instead of blank, I'm having to adapt two panels that have been imprecisely drilled for a conversion.
That won't quite work with the programs that are expecting straight lines, so I use Illustrator/photoshop.
I empty the panel, take as straight-on a picture as possible..

In my case, I got the appropriate art file for my game from localarcade.. so I have at least some holes to scale to and match positions.
Then I make some elements that match the holes, remove the photograph,
Then design around the existing holes, fill in the extra holes once I get a design that works well. Helps a bit to work from the same
template as your original panel.. which isn't always the case.