http://legouniverse.wikia.com/wiki/User_blog:Bioniclejaller/LEGO_Universe_Private_Server_-_7/5/12
oh lol that blog post
To put it lightly, the guy has only very slightly scratched the surface of how the game works.
Also, he's under the impression that LEGO being ok with non-commercial fan-created software and games (like LDraw or LEGO Wolf3D for some examples) is somehow equivalent to LEGO being ok with people attempting to create servers to run LU on.
I could post a link to the sourceforge thing where people are making some very slight progress, but I'm not sure if that sort of thing would be allowed here so I won't. But as I said earlier, even there, there's not much to see, they're still stuck on the basic act of logging in.