Thanks @Rokas for looking at that for me, I really appreciate the help - awesome! I've been playing with it today (real work got in the way!).
I'm haven't really dug into expressions etc. I've been using RC for years and years now for ArchViz but I'm doing a completely different project now so I'm need to get more out of RC.
My problem now is if I elevated the vert the scale goes beyond the vert. And I sometimes I have it stretch around curves also if that helps. See attached markup02. I copied the expression text and changed to Y and Z, but nothing changed for me.
Another issue I have come into is in tight corners the geometry creates error. What might the work around for this be also? See attached markup03 and 04.
I will in the end need to add more connected edges to make it smoother or maybe I'd add a mesh smooth. Unsure. The end outcome is to have smooth curves etc. Or is there something in RC that would solve this?