I am impressed with Fusion 360. Just using free version for a hobby.
I was going to try to write a python script to import a spline, but there was already one there in the sample file-scripts and addins.
Generated a sine curve in excel (saved as CSV)
used Sample script "importSplineCSV"
Extruded a circle along the spline path.
Copied the body and added a block under it:
Attachment 299966


Posted Gcode and ran in Cutviewer:
Attachment 299968

NC file was 79000 lines long runs over 2hr at 20ipm (6x6 inch, using a 1/4"bem)

Getting ready to try it out on the router.