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Looking forward to hearing about your results!
The rails will reduce/eliminate parallax error - indeed. The thing is that there is no parallax error with elements farther away from the camera than about 20m when just mounted on any old head - as I mentioned. Handheld that increases out to about 50m to 80m because people tend to swivel at the hips - producing about a 50cm swing-arm. So to put your rails to good use shoot panos of stuff up close (like 3 to 5 meters) - or at least with close-ish FG elements included.
I generally try to incorporate foreground elements into my photos whenever possible, though not always. I'll post back once I've had a chance to try out the new setup.