I'm still heavily involved with this project and have just made another part on my Tormach that might be of interest to the group. It is 3-D impeller:

Another Radial - this time 18 Cylinders - Page 7 - Home Model Engine Machinist

There is a series of photos there showing the machining steps and some text to go along with it. I used Sprutcam for the CAM, SolidWorks for the CAD, and the Tormach profiler tool which I am quickly becoming a big fan of. I'm finally getting beautiful surface finishes with a long reach tool. - Terry