Man, I'd forgotten about this thread. Alan, those are great drawings, but there is a detail missing that is hard to glean from the photos. You're showing the grip as straight up and down, but it does have some slope; the bottom is slightly farther forward than the top.
I'll really try to get some measurements. I've had a lot of stuff going on at work and home (including three crashes over two computers since I started this thread, ulitmately necessitating the construction of a new computer), and this just simply got thrown on the back burner.
Alan, are you working in Illustrator, by any chance? If I didn't lose the drawing I started of the grip, I can send that to you to incorporate.
Jim