El Nene Custom Midi Controller - Rafart Music Tech - YouTube
This modular system lets you snap together your own MIDI controller
Yaeltex - Custom MIDI controllers - Design your own hardware
This modular system lets you snap together your own MIDI controller
Turnado MIDI Controller
ASK ME ANYTHING! These are custom MIDI controllers by Yaeltex. USB + MIDI, configurable controls, wood case, high-quality components. 👽 Worldwide shipping from Argentina 🎛 : r/synthesizers
4 Things to Consider when Designing your own Hardware Music Controller
umidi and other custom MIDI controllers | Controllerism.com
How to build a MIDI controller (in less than 6 minutes) | MusicRadar
Tindie Blog | Extensive Customizable DIY MIDI Controller!