I’ve only built my version of @analogoutput’s mikrokosmos version of the microphonie, and that was trivial but @ChristianBloch’s photos of his mikrokosmos build might be more useful:
There’s also a video in that thread, but haven’t checked if that has any additional build details.
EDIT: Note to self: If you spend more than a couple of minutes on a reply, check if Dud has already replied before you press Reply.