I looked into putting an auto feed drill on my table to pre-drill edge start holes for 1" plate. I haven't done it as I'm afraid that the gantry couldn't handle the upward thrust and risk of losing position. I discussed it with Leon and he suggested some locking ideas but it wasn't as easy as just putting a drill on the gantry. Even a small drill can generate quite a bit of upward pressure in the range of a few hundred pounds.
At the present I'm marking the location and drilling by hand. I might buy a mag drill if I get more heavy plate work.
I'd be interested if someone has this working as I'd put one on in a heart beat.