This helped me build a protoype for a spline based pcg river, thanks!
If you follow the tutorial more closely you should get a pretty versatile road system tho 
Even without a complete grasps of all pcg concepts. But do not expect in depth explanations, that obviously is not the goal of the video.
After reading some of the newer pcg docs I think moving from structs to Data Assets would be the 5.5 way correct?