Well as the bass building bug hasn't quite worn off yet (or perhaps it's just me trying to avoid learning how to play properly?... :-P ) I'm already going through ideas of a new bass project. Intrigued and inspired by Danelectros like The Lost Patrol's long-horn baritone guitar and Daughter's DC bass in silver sparkle (my preferred body shape), I'd love to build one myself, their Masonite and skeleton bodies seem to be DIY friendly, and important original/reissue parts are still available. But there's that one sticking point - the neck... One option is to try to adapt it to suit the regular long-scale format, but I'm just not sure there's the real-estate to do that (I'm working on that at the moment). There are some fingerboard-less necks around, but for a newbie like me they might as well be a unshaped log - I really need a fretted, fingerboarded and radiused one, just with a blank headstock
Ideally though, if there were a ~30" neck available that could be used for both baritone guitar and short-scale bass conversions I'm sure there'd be a number of builders who would be interested in it - particularly if it were undrilled and symmetrical (full paddle) so as to be able to be adapted to suit inline 4/6 or 2+2/3+3 or other tuner layouts and headstock shapes. But how feasible is a neck that could suit both bass and guitar bodies? I just don't know... Maybe the experts can comment?