[ajnin]

Since you seem intent on being a reference usenet archive I think it's important to preserve the integrity of the original material. Moderating posts 20 or 30 years after the fact seems ill advised. If you modify the content in any way, at least put a prominent notice so that people don't get confused by the website name.

Also, it seems that your parsing process strips headers and that you don't keep the raw messages, however I remember that on some newsgroups people used to pass secret messages in headers that only those "in the know" would look for, it would be a shame to lose that. Access to posts in raw format would be nice in this scenario.