Just this week, I found a complete set of the published scripts from the original Eva series on eBay and quickly snapped them up. Since the books are all in Japanese, I'll have to use machine translation to be able to read them. Has there ever been an effort to translate the Evangelion Original books in their complete form?

No, they were fairly obscure until recently. I happened to find the translated intros in an old archive and apparently, nobody else had found it at the time.

https://archive.is/4tJGL

http://webcitation.org/5mYowiZN8

http://webcitation.org/5mYowkBjV

If you were to provide scans and/or transcriptions they'd be certainly very interesting to get translated in full.

That was kind of the impression I was getting after trying to do some additional research on the books myself. I'll look into getting them scanned, or at least photographed, so that these can someday be translated.