Cool! Sounds like a nice set! I love my Clausing lathe and can't wait to get a new [to me] mill.
You can get a lot of work done with just a DRO. And TBH full manual is probably a better starting point, at least from what I learned from the master machinists who taught me. It's nice to be able to be able to assess a cut by sight/sound/touch all at once while you're working the machine.
Sounds good on the half shafts. The car I twisted/spiral sheared almost exactly like the below picture and when we analyzed saw that the cracking actually started at the root of the spline.
In my case is was a 25mm diameter shaft on a 120ish hp car formula car which did launch so perhaps more load than you'll see, but still something you don't forget.
Can't wait to see the final product! Your whole project is awesome BTW!