Can't attach geometry to primitve

[callandekeijzer 0]

I'm trying to add this geometry to the primitives of an object, in this instance a cube.
 

I'm quite lost and have no idea how to continue, any suggestions?

Also, is there a way to have a rectangle spawn from the corners of the grid towards the center, whilst following the height of the surface?

VFX1.hipnc

[galagast 134]

Hi, I played around with your file a bit. I'm not entirely sure if I hit some of your questions. Here's the result:

In the attached hipfile, I colored the ones that I added to green. There are also quite a few wrangle nodes in there, but the codes are just 1 or 2 lines, hopefully it does not look too complicated.

VFX1_jlim.hipnc - H16.0.557

[callandekeijzer 0]

Thanks this helps a lot!