Thought i had just posted a reply but i must have dicked up.
make a base plate for the underside support from 10mm plate long enough to be able to clamp to your table, you now want to drill a couple of holes the same dia as your mount securing holes, push in a couple of pins to locate the mount.
Now drill and tap two holes for the strongback clamping studs, if the holes for these studs are same size as the studiron this will bring the strongback on centre so all you have to do is allign the jig ie mount located and drill in chuck then clamp this to the table so it's undo strongback next please and repeat 50 times.
Have fun
Mike