Monome.org has introduced a grid kit, based on the electronics in their latest 128 controller. They say “It’ll be perfect for our (monome-controlled) Eurorack modules”.
The kit includes a milled faceplate and bottom plate, ready to play after some assembly.
Note: Surface mount soldering is required. You choose and source your own LED. It’s hardcore DIY, so see the full guide at the monome site for details.
The grid kit is available as a limited edition for US $480.