Well, I got a little ingenious, and with some input from you guys I managed to mount it. (on a proto c.p. just for practice). A nice touch: I'm using T-Nuts and 3/4" machine bolts. This way, there is nothing showing on the top of the c.p.
Question for you all: Where do you get those black 'rings' that surround the trackball, atop the c.p.? Is this something you buy? Is it something you can make? Or are you al using some generic black rubber rings originally intended for other uses? (this is what I would like, just dunno where to find these)