This is not one of the more technical crazy projects in the channel [1], but he use two vacuum pump (it's necessary because one work at normal pressure and the other work near vacuum) and he has another one that he is not using. Also soldering the OpAmp is not very difficult, but at this amplification level my nasty cold welding will probably cause problems.

[1] Have you seen the one about aerogels? https://www.youtube.com/watch?v=X24np30GS2o