I would think it would take a pretty large lathe to 'clean-up' 18"/19" wheels. I'm aware that later lathes are set-up, using a program, to automatically re-shape (as required) the wheel. However, a programable CNC has the ability to go in and out as the cutting progresses.

I watched several videos and two used cnc machines. One was a home-made one which seemed to work quite well. However the last one was set-up to press out dents (with the help of heat) and came with a number of various shaped cutters.

I am curious as to the cost of the two wheel's 'rebuilding' and how long the shop took to do the work.

This is one of the worst curb rash areas. Two of the others aren't far behind. Why-oh-why do some people insist on parking by sound?