I've done something similar a while ago, to match my Walker replica.
Here's the procedure:
http://www.amibay.com/showthread.php?t=21060However, this does not connect to a real Amiga, the motherboard in the Walker is an ordinary pc; i changed the mouse plug from a USB to a 9-pin DSUB to match the sockets of the case. Inside the case, the cable is extended towards the mobo, and changed back to a USB connector..
Even did the modding of a tank mouse into an optical one while building my A2000PPC mod.
http://www.youtube.com/watch?v=cqgdIHVqqrI You can see it in use at 2:31.
If what you want is to use it with an Amiga, you'd either have to find a way to fit something like a cocolino inside the mouse, or rewire stuff inside your Amiga... :hammer: