You'll have to beef up the strings quite a bit if you want to tune a baritone to octave tuning. Most Bass VI type instruments are 30" scale length. Most baritones hover in the 27-28" range. The strings for Bass VI's are gonna be set for that 30" scale length. I'm not saying it can't be done, but I just think it could be done better with a different instrument. What is the reason for passing on buying a Bass VI or similar and going with a baritone instead?