Well, I went ahead and made a copy of the cofiguration that I got to work and cleaned up all the duplicate port numbers from the copy.
I managed to get two server instances up and running. Tests indicated that the cluster was working properly, so I'm assuming that I did it correctly.
It just seemed like kind of an awkward way to do it. Coming up with a scripted way to install a cluster from a single config description may be a bit of a challenge. I'll use XSL; but I'm not sure if the rewriting feature is strong enough to create directories.