Pretty interesting; I may be tempted to give it a shot. We've traced my father's family back to Germany, but about the time of the French Revolution, any trace of us disappeared. My Dad likes to imagine we were French aristocracy who fled to Germany and made a new life, but BAH! I'd hate to pay one hundred bucks to find out I'm French, LOL!
The Franks and the Germanii were both Teutonic tribes, so I doubt they can tell the difference. Pretty much all Northern Europe was Teutonic except for the Celts and the Basques.