I had a look at your file and made some fixes!
For the custom turntable, construct it at the Rhino origin and then set its position via the right-click menu to set XYZABC values. Ideally also create the meshes yourself, plugging the polysurfaces in directly will result in very heavy meshes and slower performance.
The same applies for the toolpath, draw it at the zero position!
For simple cases, you can use the dynamic rotary axis via the KUKA|prc settings, I've already activated it in my file.
Finally, it depends on the turntable how it is configured, so I'd see the current version primarily as a way for initial testing.
You could also calibrate it in a way that the robot seems "flipped" in relation to the turntable that looks vertical - that would also be fine as it's just a matter of the position in relation to each other!
Hope that helps!