I imagine the easiest option for a one-off would be Front Panel Express, and the cheapest to get a 3 or 4 HP blank and drill holes in it.
I have access to a CNC machine at my makerspace, and so cut the panel myself from aluminium sheet, and then used a vinyl cutter to make black vinyl stickers to mark the outputs.
You can open the SVG with a text editor to see the exact dimensions and locations of everything. In case it’s not obvious: the red outlines in the SVG are for cutting, and the black ones for printing, if applicable.
Hrm, looks like both Digikey and Mouser are currently out of stock. GRM21BR61E226ME44K is the same component in different packaging… and also out of stock. Any ceramic capacitor with the same footprint, capacitance and temperature coefficient, and the same or better voltage rating should work fine, though.
Thanks for the kind words, everybody!
Anyone looking to build a few extra modules for other people: please do! It’s a good way to bring the unit cost down a bit. But, please make at least one for yourself before you commit to making any for others, and do note that the design is currently in, let’s say, public beta. It could conceivably interact strangely with some other modules. If that sounds fine to you, and you’re okay with possibly desoldering and replacing a few components later, go for your life. If not, wait a bit.