While you are waiting to get one... I made a seriously accurate jig using a mill table. I just asked around from friends, and advertised WTB on craigslist. There is a hundred times more stuff like that in the Bay than where I live. The rear axle is all milled from 1" bar (Anvil is only 3/4",
) and suspends in these milled sprocket flanges, in a t-tube that slides back and forth in the table track. The BB is held in a v-block that has a bolt going though the BB, through the v-block, into a t-nut in the mill track. When that is screwed down you could hit it with a sledge and it wouldn't move.
I have it all torn apart and am making a more adjustable rear end that uses a newly acquired short mill table off a small tabletop horizontal mill.
To use it as a rear end jig:
I am trying to get Anvil functionality on the front end also, and that is taking me a long time to play with. It will never be an Anvil because it is too heavy to position. But it does make a decent rear end jig. And you can always sell a mill table set up as a welding table.