After finally scoring a motor for free (!), I'm about to start on my grinder-building adventure. After spending an hour tearing the thing apart, I can honestly say this is the most fun I've had with a treadmill. :)
Attachment 281880
Getting the motor was the main thing, but a bunch of steel, electronic bits, a linear actuator (possibly to use with a standing desk if I ever get around to building it), and a small pile of nuts, bolts, etc., was a nice bonus.