In case you're interested there was a proposal drawn up before Eva was made that outlined all the basics of the show but also contained a bunch of lore that never made it into the show I guess because it would have been sci fi gobbledygo
ok that wouldn't have made the show any better. Only some of it is translated to English and you're gonna have to go through it yourself to figure out what's what.
https://wiki.evageeks.org/Resources:...l_(Translation)