Cut the firewall for 2 bolt Master Cylinder!

Has anyone modified their firewall INSTEAD of using a 4 to 2 bolt plate to run a 2 bolt master cylinder? I'd love to see pics as I am in the middle of smoothing the firewall and it would be a good time to take care of this at the same time.

Plan is to cut/weld existing studs, drill new holes to wels the 2 new studs in, and make the thru hole smaller if needed.

thanks
-Chris

PS: converting from 4 wheel drum manual to 73 front disk manual