Using the Nomad for the rough shaping is very do-able. I don not think you will be able to get a finished lens. You will need to do final figuring and polishing after machining. I would guess you can get to within 0.05mm (50 microns) or better using fine finish cuts and a good ball end tool, but the surface will not be optical quality and will have scalloping (waves due to the tool end shape). Doing final figuring by hand is not terrible, but is definitely not for the faint of heart the first time. The tools to support this process (surfacing and measuring) are likely more money that it would cost to purchase pretty much any set of lenses unless you already have them, though you can make some of them yourself.
Commercial manufacturing is done by casting and final polish with a machine for lower end, and grinding and polishing for higher quality. These days the polishing is done on specialty CNC machines that avoid the artifacts you get with an x-y-z coordinate design like the Nomad and hold a micron or less positional accuracy.
I would not discourage you from trying (I ground a few lenses and mirrors back when I was young and was into telescopes–technology has come a long way since then), but this machine will not do the hardest/most time consuming part for you.
If you try, let us all know how it goes. I would love it if you can prove me wrong here.