Hey Keith,
I'm sorry you haven't gotten any takers on this. I wish I could do it, but it is too advanced for me, I think. I can pretty much only handle fairly simple melody lines. For example, singing the close harmony version of "Sandman" should be doable for a college educated music major, right? Sorry. Only the melody. The rest is beyond my meager skills. I can sing lots of harmony lines, but not challenging ones. I can't sing tritones, even. My voice is adamant about slipping to the 4th or the 5th.
So you see, I have serious limitations in my vocal abilities. But maybe by bumping this, I'll attract the attention of someone who can handle it.
One can hope.
vicki