How to build a surface like this bump-shape child playground; and sort and re-order points to form a surface?

Hi my friends,

I just see this kid playground from photos of Northala Fields Park by FoRM Associates.

I try to build this surface to my project, but I am quite not figuring out the way to build it with grasshopper ,which I want to have more control the points’ position, like I did with deform brush in 3DSMax.

In addition, I wonder how to sort the order of points to build the surface, in this situation. (18.1 KB)
sincerely (18.1 KB)

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Thanks very appreciated Joseph