You can still use a fanned fretted board with a standard neck. when i did it i only used an 1" difference( 25" and 26" scales). and layed it out so the bridge was the "straight fret". cool thing bout doing it this way you can change with fret board with alittle work and use the longer bass side scale if you dont like the franned fret. im not sure how big of a difference one would want to go im thinking around 1.5". i just kinda shot for half of what everyone was doing with a fanned bridge. little food for thought