Great insights.
Eiji, I use the high 6th string not so much because I need the range, but because I take my cues from funny places. You get used to going up a pattern, land somewhere, and come back down a different way. The 6th really keeps me from having to think while I'm playing, and that's a good thing.
Yeah, Alembic can make anything, that is for sure, but it IS important to play everything first to get a feel for what you like. However, it isn't always possible/easy to play the things that you think you would want because they aren't readily available. For example, to me the difference between J-bass and P-bass spacing is a universe, even though it is only 1/8 of an inch. How would I have known that without playing both? Having said that, if the wider spacing was all I ever had, I would have been perfectly happy with it. Hmmmmm.
Danno (or anyone), would you be willing to measure your neck width at the 1st, 12th, and 24th, along with string spacing at the bridge? I haven't been able to find Alembic classic taper 6 dimensions on the web.
All interesting questions. Alembic's flexibility is a two edge sword. You can get whatever you want, but for most of us a new Alembic is a significant event emotionally and financially. It is scary to take big risks on unproven assumptions.
Pace, where we draw the line between guitar and bass is a good question. Do I want a low guitar, or is there something intrinsic to it being a bass that affects the way you approach it? In the old days of fiddling with MIDI guitar controllers, the trick was to approach your playing from the standpoint of the patch you were playing. If it sounds like a flute, don't play it like a guitaist, THINK like a flautist. Is that true here too? Am I erasing the lines that distinguish the instruments? Oddly, BTW, I play guitar and bass without a pick. Yup, electric guitar with my fingers. So much more intimate.
Jazzyvee, the only reason I can think of that the necks should taper is so there is room to pluck/pick/slap. You don't need a lot of spacing to push them down against a fingerboard, but you need a little more room to grab them from the side.
Thanks for your two cents everybody!
Cary