In my journey across the internet to find clues on how to work with holograms and rwx and other previously obscure worlds knowledge, I came across a bunch of personal pages and resources.
Here are some from enthusiasts of Worlds Chat Japan:http://www.yo.rim.or.jp/~bhouken/rimchat/rimchat01.htm
I'm not sure if there are other pages to this one other than the tutorial. It is very in depth. One thing you will see common to these tutorials is that you couldn't host custom mov avatars like you can now (much to my dismay when I was learning). What these people did was share the files with their friends renamed as one of the default avs, basically overwriting it with their custom one.
http://www.mirai.ne.jp/~oguma/wcj.htmI think this one is very funny. They say they are part of the "Mongolian club" (not actually Mongolians) and they greet each other by saying "Mongolia" because it's less boring than just saying hello. Almost like how we say kiwi in Worlds today.
http://www.aquale.net/wcj3/This one has some adorable custom .mov avatars that can still be downloaded. Might be worth hosting these for use in Worlds.
http://www.venus.dti.ne.jp/~atm/atm/Another group of cute avatars. This guy has a blog that goes up to as recent as 2001.