A couple things, Jim.
First of all, I recommend getting at least one Ebony laminate in the neck; by all accounts (as well as my personal experience) it's the biggest single thing you can do to affect/enhance your tone.
Neckxt, you might consider adding Vermillion to your neck; since the woods in the neck affect the sound a lot more than those in the body, a Vermillion laminate or two in the neck might have more effect (and with less weight) than having Vermillion for the body. My understanding is it's a straight swap pricewise for purpleheart (or you can go nuts and get BOTH like me)!
Finally -I don't know how to do links- but in case you haven't done this, you should: go to Alembic's main page; click products; click basses; scroll down and click on body woods; and then read the descriptions of the various Alembic body woods -just to make sure you're familiar with this info, and have it under your belt as a reference for discussion with Susan, Mica, and other club members.
I found it interesting.
Exciting, isnt' it? I look forward to seeing your custom join mine in construction!
By the way, my quilted maple, maple-bodied 6-string Elan (with 5 purpleheart neck lams) sounded great, very bright and crisp. My maple-bodied 8-string Europa -with 6 Ebony lams- sounds even better -though it has a powerful dual Ebony/Maple sound.
I haven't owned an Alembic with any other body material than Maple, so I can't comment on Mahogany or Vermillion from experience -though I'm getting Mahogany for my core for my current custom-in-progress... based on testimonials/reputation, and on the desire for a different type of sound.