Here is the the schematic for the project drawn using KiCad:

https://cdn.hackaday.io/files/1607926879324928/TurnadoHardwareMidiControllerSchematic.pdf

You can also find the .sch file in the project's GitHub repository.

It's the first time I've used EDA software to draw a schematic, and the first time I've drawn a schematic of any kind in a long time (other than using Fritzing every now and then), therefore I'm not sure if it's laid out in the optimum way. However it should tell you everything you need to know about how to wire up the circuit for this project if you wanted to give it ago yourself.