While I waited I figured I would try doing a few other things
I have designed my controller (to be used with the portable)
to have built in rumble that runs on the n64's power (3.3 v)
This can also work for the n64 controllers not ment for portables just place the power for the rumble pack on the controller's 3.3v and ground, simple, really simple
PICS!
HEre is the whole thing

here is a close up on the rumble pack's board

Here is a close up on the controller board

I apologize for my crap camera

