There are several options available at
FalbaTech in Poland.
AFAIK, FalbaTech is the only one who makes machined PVC cases. A metal plate would be separate and you could use through-hole diodes. You could also go without a plate and use PCB-mounted switches (switches have two stabilising pins) and optionally: PCB-mounted stabilisers if your PCB is of such a revision.
FalbaTech also has acrylic cases (like what Massdrop used to have) and 3D-printed cases (which I think is what Dox made for himself originally).
I am not sure that the acrylic cases support stabilisers - the ones at Massdrop didn't, because of a bug in the layout.