Custom 16-Channel EEG Board Design

I am working on a prototype and I want to build a custom 16-channel EEG board by combining the OpenBCI Cyton and Daisy designs into one single PCB. Cyton board: https://github.com/OpenBCI/V3_Hardware_Design_Files/tree/master/OpenBCI%20Cyton%20... (Budget: $15 - $25 USD, Jobs: Electrical Engineering, Electronics, Embedded Systems, Firmware Development, Microcontroller, PCB Layout, Signal Processing, Technical Documentation)