For people who are hand building their cases, I've put together a set of panel templates based on the files janvantomme posted earlier. I've put some basic instructions in the PDF itself, but it should be pretty obvious how it's meant to be used.
The outer border shows the minimum INNER dimensions the front and side panels have to be to give you enough room (almost identical to the original file).
-a guide showing the bottom plane of the PCB (not including solder points) for figuring out where to position it if you use standoffs instead of mounting to the panel itself.
-center marks for all of the round holes in the front panel, for drilling pilot holes. With a steady hand and the right size bits you should be able to drill out the holes for the audio, midi and headphone jacks without any filing needed.
-a mirrored template for using on the inside faces of the panels, since I can imagine designs where that would make aligning the template easier.
I haven't actually made an enclosure with this yet but I did print it, cut it out and check the alignment of the two halves against my axoloti and it looks like everything lines up as long as the inside faces of the panels you cut meet where the line marked A on the template is.
Axoloti front panel and DC input templates
Hope this is useful!
(still to do - measure and add drill guides for the panel-mount holes on the MIDI DIN jacks)