How to build a low-cost high-quality 32 channel EEG device by ourselves?

We previously suggested this architecture based on PiEEG:

https://forums.raspberrypi.com/viewtopic.php?p=2178452#p2178452

But PiEEG developer Ildar Rakhmatulin has pulled PiEEG with 8 channels from the market before it has been released:

https://www.crowdsupply.com/hackerbci/pieeg#products

We therefore suggest to build 32 channel EEG devices from this architecture:

Together with this architecture: