Extended range is a curious thing, I see two ways that it can be utilised: literally the extended range of the instrument, and also the percussive element of such low tuned strings- both are something i'd like to add to my playing.
Wes: i haven't quite decided yet on the scale(s) for my 8, i'm going to wait until i've finished my fanned 7 to see how that plays to decide. If it plays nicely, i'll probably do a little fan with a straight bridge- something like 25.75"-27", or 27"-28". If it doesn't feel quite right, the plan will be a 'regular' 27.5" scale, but i'll fiddle about working out a nice even string tension, so it feels nice to play :)