Hi,
My dad (the machinist) finally made the knob. It's a 4" tall and 1.5" thick slug! It feels real good to shift with.
I took a few pics using my (cheesy) webcam, but you can see what it looks like. Seeing how it gets real cold (it's a solid aluminum piece, with a steel thread piece), I found a foam/rubber material from a mini gardening shovel handle and it fit perfectly (and it's got a good grip too). I'm gonna find a way to get it painted yellow real soon.
Here's the URL (warning, about 5 pictures, each about 55KB)

:
http://www.cubicdesign.com/mustang/shiftknob.html
Bye!
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Gautam N. Lad
http://www.cubicdesign.com
http://www.cubicdesign.com/mustang/