We're pretty active around here, John.
If you're new to the world of Alembic, then you may not be aware that there was a price increase at the start of this year. As a result of that, there was a larger than usual quantity of orders made at the end of 2004. This puts extra pressure on the staff between finalizing details on these instruments and actually building them. Everyone out there is insanely busy.
I believe this is a temporary thing, though, as they have always been extraordinarily responsive in the past. Your dealer is probably in touch with someone at Alembic on a regular basis and should be able to follow up for you. If you are comfortable that your instrument was fully specified when you placed your order, then I would let it ride. Otherwise, you can try checking in through your dealer, or calling Alembic directly.
I am in a waiting mode as well and I will try to check in every couple weeks until my bass actually starts production, then I will get out of the way until it's done.