just noticed the extra fret. eventually all of my wishes will be incorporated.. IMHO they all made sense to bring the birds to modern day acceptable/excepted features of a bass.
That 4 string neck is a crap Chinese one I hacked up. Unfortunately Allparts only sells LH Jazz 21 fret necks. I know that's not your thing, Jim...but I am talking to a neck builder who can supply me with whatever a customer wants, including scale, shaft and fret board wood, profile, frets, fretboard radius and a tilt angle headstock of any design. I'm looking forward to that. We've also discussed a full on through neck '64 Reverse replica.
The Fiver does have the extra fret.