Hi Daniel.
Here are some of my thoughts, to help you with your request for input.
First off all, I'm going to provide you with two links pertaining to you question (all on this site) that you may or may not have seen:
(1):
http://www.alembic.com/info/custom_options.html -read tone woods at the very top.
(2):
http://www.alembic.com/info/woodsamples.html -scroll down to body woods and click on each of the individual body woods for a description of the sound of each wood.
In case you don't know, as a rule, on Alembic neck throughs, with their construction methods, the neck woods have the biggest impact on sound; then the body woods; then the top/front and (if applicable) back woods.
I see you intend to get Ebony neck laminates. This is an excellent choice, and will have a dramatic and massive effect on the sound. It increases both the overall sustain, and -in particular- the sustain of the fundamental/lowest partial substantially. You have to hear it to appreciate it.
Mica tells me that they currently tend to recommend just 1 or 2 Ebony laminates in general, 3 at most. This is because the influence/effect on the sound is so substantial, it's almost overwhelming. And they say you can get virtually the same effect (of a full complement of every other laminate of Ebony) with only a few laminates.
So keep this in mind. The more Ebony you have in the neck, the more it will influence your overall sound, and (conversely) the less relevent other top/back and body wood choices will be. If you really want to hear the effect of your top (and back woods -if applicable) you may consider reducing the Ebony laminates to one or two. For further info, consult the experts -Mica and/or Susan.
If you click those links, you'll see that Maple tends to sound very bright, and Mahogany -the standard default body wood tends to sound warm/rich/neutral. They call Coco Bolo the Crown Jewel of tone woods and hold it in regard -especially in conjunction with a Mahogany body -though many club members have their custom Coco Bolo basses built with Maple bodys.
I have no experience with Redwood... but the description(s) I've seen on the site refer to it as having similar tonal characteristics to Maple... very Bright.
Will Gunn has an absolutely stunning custom Burl Redwood Balance K 5-string for sale. There is a picture of it if you scroll down in this thread. Note the Ebony laminate in the middle:
http://alembic.com/club/messages/631/34682.html?1168461535 Hope my thoughts are helpful to you, and good luck on your future custom!