Eva-01 was produced by the Hakone branch of Gehirn as the Evangelion Test Type model. Unlike the other Evas, she was generated directly from the body of Lilith, and is consequently referred to as Lilith's "offspring" or "clone" (㠪㠪㠹㠮å 身, Ririsu no bunshin). On a physical level, Eva-01 has the same characteristics as an Adam-based (i.e., any other) Evangelion, so the exact nature of her relationship to Lilith remains a subject of debate. Eva-01 received her soul as a result of the Contact Experiment with Yui Ikari in 2004, but was not "finished" until 2014.
As with the rest of the Eva Series, she was ostensibly created as a weapon to be used against the Angels, and she was the first Evangelion to face actual combat (against the Third Angel Sachiel).

It's been a while since I'd last worked on this project. An earlier version of this was incorporated in my Evangelion Unit-01 (Docked) MC map. I'm not sure whether I'll finish this or not; I already have several projects I'm working on, especially the AAA Wunder.

Well, Enjoy