This is only for licking force and potentially body force measurement. You can find the fabricating and assembling process from the video at the beginning of this email. The process is by no means simple, but I imagine most projects probably won't need them.
This is the modularized unit for the mechano-optical transduction. https://github.com/oconnorlab/Xu_et_al_2021/tree/main/Mechanical%20designs/Perch%20core
This converts up to four channels of phototransistor current to voltage change. https://github.com/oconnorlab/Xu_et_al_2021/tree/main/PCB%20designs/PerchEagle/PerchPCB_v1