Meshing from points issue

Hello Grasshopper community,

First of all I would like to thank to all Grasshopper developers, especially David. I am new to Grasshopper. I've tried to automate what I was designing manually in Rhino for a long time. I really don't know how to organize derived points in order to create a quadrant mesh (use points as a vertices). All my attempts failed. I've tried to bake and set points to @point@ node and mesh them using construct mesh node. But it doesn't work when I change the number of planes (intersections) - i have to set points again. Please see example below

There are also several questions on how to improve some operations:

- divide curves on the same height level

- select proper trimmed surface without guessing it's index in the list

I'm very appreciate for your time and help. Thank you in advance.

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Ilja