Hi Steve-
I'm sure such a thing would be possible, but I don't know a) whether anyone has actually done it, or b) whether it would be as useful as an actual authored style spec, which would normally include some rationale for style choices as well as descriptions, and probably would be organized differently. Though, as you point out, an awkwardly-organized spec that's up-to-date might be more useful than a hand-crafted document that's out of date.
--Clay