We made this in 2006, in response to a request for a steel string guitar that would play B - A across eight strings. There was no way the bass string could play a decent B note without being much longer, and no way the top string could play the A note without being shorter. Hence the idea of multiple scale lengths. This is probably the best possible example of how far you can push the idea.

I don’t think we could justify having more extreme angles that this. It wasn’t easy to play, you can see that when moving across one string at the higher position, your fingers could easily move up or down a fret without intending to

There is a weird effect with an extreme fan like this - bending a string doesnt get the result you might expect. The string does get tighter by being stretched, but the string length is getting shorter, or longer, depending on which direction you are bending the strings, so the note doesnt change as you might expect . It's very odd!