I had written a lengthy response myself with a bunch of the data that came up when my bass was under design/construction, but Mica's post hit before I finished so I canned it.
Of course, the easiest way to know what the specs on a particular instrument are involves the use of a caliper and direct measurement. Alembic basses, being hand made, may not 100% match even the specs under which they were intended to be built, custom or not. Is accuracy to four decimal places even possible?
As a side note, I believe Mica's numbers are based on a 45-65-85-105 set of strings. I'm not sure if it would matter, but the spacing would be less symmetrical if one were to switch to a less linear set of strings, say Jazz Flats at 43-56-70-100.