So far, all I been able to design are some use case, sequence case and the class diagram.
First sequence diagram:
Start up sequence.
Read config file.
Open Port to hear server registration.

Use Case Diagram:
Login Server or World Server registration to cluster controller.

Respective Sequence Diagram for Login Server Registration

Respective Sequence Diagram for World Server Registration

Client asking for a Login Server Use Case

It´s sequence diagram:

Client asking for a World Server Use Case

Respective Sequence diagram:

ClusterController Clase Diagram

Original UMBRELO UML modeller xmi file:
http://aullox.com/~criptos/TMW/clusterc ... roller.xmi
So far so good?
Also, for doing some more interesting thing, I´m working on the server concept for the most developed systems so far...