The website has a .STL file, which isn't the easiest to edit. (I use 123D design - an old non-supported subset of Fusion 360 for designs) I printed a quick test copy of the panel, and discovered that my switches are too wide for the existing panel. The outer cutout is fine, but the inner cutout is square, and mine are rectangular. As it is, that prevents the threads of my switches getting through to the bottom. Basically I need to cut out a box aligned with the existing outer box down to the round holes.
(Also, the triangular pieces on the bottom add a lot to the print time because supports need to be printed all the way "up" to them (assuming that one prints the unit upside down.)