I picked up the identical #32 grinder off eBay quite a few years ago and motorized it with a 3/4 horse (overkill) motor. When using pulleys make sure the grinder you get has ball bearings and not bushings; bushings will wear out quickly because of how the belt pulls on the grinder.
Here is a few pics of mine.
I have added a stainless steel meat tray since the original build but I can not find those pics right now. Anyways if this interest you here is where I got my plans to work off of - http://www.sausagemania.com/grinder.html