Boards were designed in KiCAD and ordered on AllPCB. The schematics were as following:

Currently it uses all available ports on Nano Pro board:

D2 (pin5) – right fingers WRITE

D3 (pin6) – left fingers WRITE

D4 (pin7) – arrows WRITE

D5 (pin8) – service buttons WRITE

D6 (pin9) – left thumb WRITE

D7 (pin10) – right thumb WRITE

D8 (pin11) – left LED

D9 (pin12) – right LED

D10 (pin24) – READ 8

D16 (pin23) – READ 4

D14 (pin22) – READ 2

D15 (pin21) – READ 1

A0 (pin20) – left joystick RL

A1 (pin19) – left joystick UD

A2 (pin18) – right joystick RL

A3 (pin17) – right joystick UD

The KiCAD outputs are uploaded here.