Marc,
If you're going to go with having Alembic build you something, ship them the Anniversary Electronics and have them build you a bass to your specs. As I've said before, my Epic 6 with the Ebony Lams was INSANE. Never had more low end than with that bass. It had a flame maple top, set neck, and East Meets West Electronics.
Maybe see about having Alembic build you a set-neck bass with your hand measurements, and installing the Anniversary Electronics in that. If you're going for a set neck, definitely opt for at least one Ebony Lam, you'll cry over the low end every time you plug it in.
If you go for a neck thru, have them build you an Essence with a custom body shape (that will fit the Anniversary Electronics) with a custom neck to your specs. I'd go for 2 or 3 Ebony lams, if you can afford it- they're expensive, but worth it.
Maybe 2 purpleheart, and one ebony... You're going to have a wider neck (almost the same dimensions as a 5 string, I'd wager) and you'll want at least 3 laminates. Stick with maple for most of the neck, though- these other variations look cool, and I'm sure sound cool, but my guess is you don't want to get overly fancy with what you're doing, and driving yourself crazy over weird neck lams isn't going to help your cause.
Or look for a good used Alembic that might come closer to your specs... Perhaps a 5 string that could be modified slightly into a 4?
Good Luck, and See you in NYC, Next Saturday!!!
Frank