Spent a while tonight playing around with Inkscape, slowly getting more productive with it as I learn more features. Made a 1:1 scale mock of the control panel that is going to go on the top of the speaker enclosure (for the wood texture I just took a photo of the speaker and loaded it into Inkscape):
Once I have the layout looking good, I create a drilling template in another layer. This template gives me the location and size of the hole to cut in the speaker enclosure, the size of the MDF sheet that I am using to make the control panel (no metal sheets on hand), and the drilling template for the MDF:
This is the same method I have been using for pedal templates lately. Mock layout leading to the drilling template and the decals.