Nice result. There are a couple of things to consider when doing a mod like this. The stainless steel can catch you out when drilling and tapping, it is prone to workhardening. I would recommend sharp drills, slow rpm and good feed rate to minimise the danger. Make any holes to be tapped on the loose side, not tight. With a self extracting quill taper, make sure there is going to be a conflict when clamping on a bracket to the end.
I had trouble drilling one of these hardened stainless readouts and had no option but to resort to a solid carbide drill to finish the hole.