I have build a Norns DIY, called Fates
Fates is basically a DIY  DAC "shield" (or board) for a Rasperry Pi4. The behavious is 100% compatible with the Original Monome Norns.

Here's a first example just 5 minutes after I had finished building it.

Here's the PDF of the Owner's manual and the original presets of the Crumar Bit 99, a vintage Italian Synthesizer

Attachments:

File	Description	File size
Crumar Bit 99 Manual		795 kB
Crumar Bit 99 Presets		17 kB

This summer I discovered (I know I was late to the party) all Mutable Instruments "old" projects like the Shruthi, Ambika and Anushri and built them all (many praises to the genius of Emilie Gillet...).

The last synth I built was the Shruthi-XT (I alreaday had a Shruthi-1) and this time I decided to go all the way, ordered a beautiful Metal Case from Adrian Hallik, I decided to go "all white" with white panel, white knobs abd blue screend and leds. The case is a bit expensive (it's not just acrylic, after all) but it's really superb-looking and well built.

The result was pretty satisfying to say the least and  am very happy with it ;-)

I have always wanted to use more than one CV Pal Modules on my MAC. They are quite reliable and inexpensive (a full kit is about 30 euros on Thonk, plus there are PCB/Panels options everywhere).
The module is super easy to build, just a few thru hole components, I built 2 in an hour or maybe less. You get USB-MIDI with some additional configurable options as well.

There's only one minor problem: if you want to use more than one unit on your system, you can't. Unless you re-program the Attiny84 that comes with the Kit (or program if you have a new Attiny)

Read more: Multiple CV Pal Modules on the same computer