This is information Emmett sent to me about the SB10 and what he could do to my Graphite 12 string Grand. Again I've decided not to do it, but here's the information.

Your graphite Grand Stick could be converted into a "Ten-String
Grand" by replacing the bridge and nut with hardware that I already
have, and two of the headstock holes for 6th and 12th tuners could be
filled with black epoxy.

I'll call it the "SB10": The limits of 4ths across the board (in a
single sequence) allow only nine strings before you run out of
tension at the high end and hearing range at the low end.

So I came up with "conceptual 4ths" where the middle two strings are
tuned in unison. Then, placing your hands a 4th apart (a distance
of five frets) along the board, you have your consecutive 4ths
across all strings - glibly explained.

The mind can always defy the laws of physics, so, If you like the
conceptual world, I'd recommend:

- 1st high D, 2nd A, 3rd E, 4th B, 5th F# / 6th F# again, 7th C#,
8th G#, 9th Eb and 10 Bb.