I like it! I love World or Warcraft inspired cosplays. I may have to do one in the near future.
I know you mentioned the sleeves, what are you planning to do?
Will you have a weapon? It's been a while since I've played so I don't know if there is a standard weapon or not.
As for the leave, have you tried a type of glue? A super glue perhaps?
When in doubt: Duct tape it.
Giant Diglett will return!
In the works:
-Scallemaille original design Gyarados