Rolling back multi-db to single DB

We've written a script to effectively reunite the databases (as they would have been w/o multi-db deployed). This seemingly works fine.

However, there's no documentation as to what needs to be done to the WPMU configuration files (which ones, where, how) to complete the reunification and eliminate multi-db from the equation.

I believe we're on WPMU 2.6.1 at the moment.