Okay Steve....here we go again.
I swear, I wrote an entertaining book a few hours ago. Can't do that again....just going to meat and potatoes.
I'm an experienced machinist.....forget a lathe for making things you need in 1/12th. Nasa might have a lathe for you.....but......
You need the 'bell' on the cymbal and maybe a slight parabola or arc on the cymbal profile (depending on NP's cymbals)....and not things that look like hats on rice paddy workers.
You need to make some plaster or resin dies (preferrably resin).
Look at the bottom of soda/juice bottles.....especially Tropicana 12oz OJ.....you can mold from that and file/sand high spots from there....and it will form a bell.
This will give you a 'male' die.....forming the 'female' die just requires putting a barrier over the male....tin foil....maybe vaseline....and finding a way (that's up to you) of using resin to mold a female counterpart (which will need some filling and sanding, no doubt).
Hole saws, wing bits et al will rip and tear the thin stock you need to use.
Once you find a gold colored foil or thin stock, you need only to place it between your two resin dies and trace around it with a very sharp blade. You will obviously need to make dies for each size cymbal you need. Lotta work. Try to leave a 'flange' on the bottom of your 'male' dies to have something to cut against with your blade.
But pop/juice bottle bottoms are the best/quickest thing I've seen to replicate the shapes you need....(and I've been thinking on this a long time).....check glass....plastic etc.
...Also....as you will need very thin stock to form cymbals.....you should 'coat' the bottom sides with something to stiffen them. Plus.....you should lightly score the metal in circles with some light sand paper before molding the cymbals.
That's pretty much it minus the laffs and B.S. I added to my aborted post. Man that broke my heart. I put a lot of thought into this.
PS: Don't get caught looking at too many bottle bottoms!