In retrospect I should have either started with a more straight forward shape or taken the Tormach class and used a CNC mill to cut the curved profiles. I'll almost certainly make stupider mistakes on my next project.
Let's get started!
Step 1: Shape the outside
Step 2: Flatten and drill the top
After taking the piece of metal out of the lathe, I cut it on a horizontal band saw, then loaded it into a three jaw chuck on a rotary table on a vertical mill.
A couple of light passes with a fly cutter gave me a flat surface. After that, I used a center drill to start the three holes that eventually would be used to shape the pasta. After the center drill, I drilled a 1/16" pilot hole all the way through the die and then a 3/8" hole three quarters of the way through the die.