I, too, am researching a Mathis line out of Voralberg. My great-grandfather, John George Mathis (born about 1850), married a Katherine Hellrigel (or perhaps Hell? - I think that a name change occurred.) in 1872. I believe he and his family came to this country around 1871. Supposedly John George was from Daraberg, a town that I have never located, but was said to be near Feldkirche. Kartherine Hellrigel was the daughter of Joseph Hellrigel and Carolynn Bundt.
I don't know much else. How does this correlate with your info? Any suggestions?
... Eric Mathisebmmathis@worldnet.att.net