I'm happy to help out too if needed, would you guys prefer these to be found from screenies or videos, or could I also use SWG Legends as a resource for npcs (while its around).
They use all three I believe.
In terms of videos, this is the best source possible, since it catalogues nearly the entire game: https://www.youtube.com/playlist?list=PL485CDF01E8993C3A
If you have screen shots or can find some, those are greats sources too.
The wiki is a great, if somewhat incomplete, source: http://swg.wikia.com/wiki/SWG_Wiki
And finally, SWGReborn/Legends is probably a good source too. I can't think of a reason to question the accuracy of the NPCs on there, but just in case, it may be best to use an original source if possible. Maybe a dev could weigh in with their preferences on this one. I do believe one of the devs said that they often use Reborn as a reference for how things were, so that should be good enough reason for you to do so too.
It's nice to see you wanting to help out! Anyway, I hope that helps.