I may just invest in a 2 or 3” travel indicator to get better use from it. You are right, this is an old school DRO.
I did the milking all by eye. Lay out the ones and angles and just kill to the lines. Made it up as I went.
The 7/16” cobalt roughing end mill at 1500 rpm removes 6061 very well. I was impressed. Left a decent finish too, certainly good enough for this project.