Danno:
I used to own the Acacia 10 string pictured below. It was a nice bass, but ultimately not for me. For one thing, it wasn't an Alembic! Also, the wenge neck and board was, I think, a mistake: too midrangy, hence too muddy. The wood choices you made, with the accuracy of Alembic electronics and the help of the sustain block, will be much better. The ebony neck lam will really enhance the low end- you will be shocked at how much difference it makes. (I was, anyway!) Will you have your octave strings on top (closest to your body) or on the bottom (closest to the floor)? The choice really affects the tone.
One thing you might want to think about is a stereo output. The tone you can get running a 10 string into 2 amps (tube distortion for the bridge pickup, and a cleaner, bassier tone for the neck pickup) is unbelievably huge. You can also do the same thing with a mono output by using a splitter box, which is how I did it. Either way, when you get your 10'er just try it: use your rig for the lows, and your guitarist's rig for your high end. Total world domination, bro.
Oh, one other thing: don't sell the Ripper. Rippers rule, in their own peculiar way!
Here's the Acacia:
