There's probably a reason this isn't done.
E: Apparently grand staffs don't butt against each other like this. Separated allows for Left and Right hand designations on instruments like piano.
I'll think on changing it.
E2: Updated Image to include a normal grand staff. Since the notes have to be within 7 frets of each other, it might be able to imply which string to use in the event of chords or tapping. If nothing else, it'll make tabbing from piano easier.
