So, after collecting a lot of bits and pieces, reading a lot of documentation I finally started building my midibox.
You might think: "what on earth is a MidiBox?". Well, that's pretty well explained at the Wiki of midibox.org
I'm making a MidiBox SID.
Probably I won't use the standard black casing, but build my own from UV-reactive "plexiglass" (Acrylic glass or poly(methyl methacrylate)).
What it should do eventually:
I've done quite a lot of it already, so I'll be backlogging real soon 🙂