Hi Yoshi. Thanks for your answer! I can speak german quite well but writting is a bit more difficult (I'm french). But german will be fine for me for a skype session!
Regarding the CWI, I would say: focus on your exams first! I wish you much success with them.
Whenever you will have time, I think it would be excellent if you could talk about the CWI with students and professors of the erlangen-nuremberg university, and see if you could federate people around the Wikirating concept and, why not, create and lead a working group for the development of a CWI.
I think that it could be of much interest for a worgroup project or a diplomarbeit.