When you say the frets aren't fanned, do you mean the angle isn't changing? If that's the case, I don't see how you can have different scale lengths on the treble and bass side and retain proper intonation. Maybe I'm missing something. The frets have to be fanned, do they not? In this case, I think there is no perpendicular fret, or rather the perpendicular fret is some imaginary fret in front of the nut.
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