you would also have to do major surgery to the cut aways ...
you do realize if you utilize a standard J-bass body design, all of this extra neck length would have to be put exactly where the 24-fret extended fretboard overhangs, and that this would be one incredibly deep neck pocket, and that all of those extra frets will be just as inaccessable as they are on the extension neck?
to do a 24-fret J-bass influenced design, it will take some serious body redesigning to get it all to work ... and then you'd have completely lost the Fender vibe IMO
all the best,
R
p.s. Alfang - the original post made complete sense to a fellow bottom dweller

I guess it's kinda like me hearing a group of thin stringers (guitarists) having a deep conversation about the best 12AX7 tube to use in their preamp. phhht! :icon_tongue: