I always get my mesh by 'feel' rather than anything else. There is the paper method, where you run a piece of standard paper between the spur and the clutch bell. When you have the correct setting, the paper will be folded but not ripped by the gear teeth.
By the way, did you get the con rod for the NX3.0 or stick with the NT16 one? Also, where did you get the parts from? I don't think they are available over here!