A cached copy of dmtworld.org used to be accessible via the Wayback Machine (archive.org) -- I remember looking through it about five years ago. But apparently the current operator of the domain (looks like a generic spam/advertising site) added a robots.txt file that stops archive.org from displaying any previous cached copies.  I would assume that those copies still exist somewhere, but they can't be accessed by the public

As I recall, the Nexus was created to fill the void after DMT World went down.  So we're a continuation of DMT World only in spirit, not in actuality (thus the old databases are not preserved on this site).

I remember lurking on the DMT World forums around 2003/2004... were they really around since the mid-1990s? As far as internet discussion boards go, I remember those being the days of Usenet boards. If you're looking for Usenet posts, I think that archives of those discussion boards can usually be found.

Good luck in your quest.