Press brake auto back stops - DRO / Accuracy

Anyone ever make an auto back stop for a press brake? Just curious if
anyone had and what construction method they had maybe used? I'm
considering making a small press brake for bending metal as the local
shop takes ~FOREVER~ to do pieces for me. It'd sure beat waiting.
Looking at something with DRO and accurate movements.. ie backstop move
to 4.050" from 2.250" and back again or some such for bending small
brackets, gussets, etc every other bend. I would like to see something
w/ resolution - accuracy around .010" or less as long as it would be
repeatable?
Darren Lucke