To get a preview of how the tool will cut, draw up such a tool in profile (or import the DXFs):
The tool drawn above is:
With a profile in place, it is simply a matter of matching up various V endmills at appropriate depths:
(depicted are 30, 60, 90, 120, and 150 degrees)
This also brings up the fact that one could make such cuts using a series of V endmill and then sand to the desired profile.