Putting users on a different partition than the operating system

[NonComposMentis]

I am trying to bring up a system that has the operating system on one partition (C) and the Users on another (some other drive letter). I have tested symbolic links and they work very well … until you get to low level data scrubbing. I have read the solutions that involve replacing every key in your registry (ala Joshua Mouch) and decided instead to rebuild the OS using autounattend.xml, as everyone seems to agree that this is the best solution … except at this point I'm not sure "everyone" ever actually did it. Anyway, I downloaded Microsoft's WAIK and proceeded to make selections using the "Getting Started for IT Pros" documentation. Nowhere did it ask me where I wanted to put the Users (either in the documentation or in the Users section of the SIM). The answer file it created was xml so it could be edited in Notepad. Presumably autounattend.xml could too, although I haven't gotten that far yet. Does anyone know what I should do next to put my users on another partition and/or drive?

By the way, I have not tried vLite, but I read on another forum that it has no option for putting Users on a separate partition:
put user-data on separate partition with nLite? - MSFN Forums