Hi Tobias,
if you live in/near Munich I probably can help you with a contact...
On this Sunday, 15.07.2007 there is the "12. Japanfest" in Munich/Englischer Garten around the Teahouse.
http://www.djg-muenchen.de/veranstaltungen/?id=105
There will be a stand of the "Freunde des japanischen Schwertes" where you can ask questions ect. I will be there too...
Otherwise we (the guys from this stand) meet regularly each month in a tavern in Munich, where you can bring your blade and get information. Some of them are really Nihonto-professionals
You can send me a message for more details.
Greeting from /to? Munich!