Bumped to let you know I bought one of these trackballs. I have an idea how to mount it using a couple of aluminum strips.
This is a pretty neat ball for the price (I got mine at:
Sparkfun)
I think it is the same, it looks the same in the pics.
Anyway, hooked this to my desktop PC to test and I like the way it works.
I played World Class Bowling and it handled pretty good. (Also Capcom Bowling and a few spinner games).
I know its not as good as a happ, but for a cheap build it will work, and for a compact build, the size is pretty compact.
Some gripes:
The lit ball is neat, but it may be a little too bright. (There are two pairs of leds inside, one might could cut the lead to one of the pair to decrease brightness, I havent tried it though.)
It has two colors, green if neither mouse click button is pressed, or red if either button is pressed. (These would be the mouse buttons you can connect to the wiring harness that comes with the trackball.)
It would be nice if you could turn on the colors without having to hook up buttons (IE have the printer port or Led Wiz control the colors), (probably can hack it, looks like it might be simple to do).
The one thing I dont like is that the ball stays lit when the computer is powered off (Not sure if this would be with all computers, evidently mine keeps 5 volts on the PS2 port powered up.)
But this could make a good night light I suppose.
The ball is easy to take apart, and its construction is simple enough.
Mounting it will be different, but like I said, I do have an idea, will post again when I get a chance to try my method.