Mag drill power feed Setup for line boring

I aquired a mag drill driven line bore set, and it's a hand fed rig. I was wondering if anyone has ever seen a variable speed power feed for a mag drill or mag base annular cutter? If anyone has ever built an easy to use, nice designed set up like this? Or if anyone has any ideas on this. I haven't even got to try it out yet, Im just looking for ideas.

Mag drill power feed Setup for line boring