Hi Guest,JR,
A true left handed fiddle has to be made differently from the start.

The sound post is on the (high) a-string side, and the bass bar is on the (low) g-string side, and these are internal, and cannot be switched. There are other subtle differences in construction as well. You could expect that merely switching the strings and reshaping the bridge and the nut would get you started but would not result in a truly good sound. Also you may find that getting good instruction is difficult, as most teachers and players play right handed even if they are true lefties.
MD