Geometry Nodes - Problem with Random Instance Rotation, when using Arc and Trim Curve nodes

Question

I have a problem with Random Instance Rotation, when using Arc / Trim Curves node. I'm trying to do something similar in this tutorial, but only with Geometry Nodes.

Here is my node set up:

Which results in this:

Arcs have different heights, which I want. But I can't make them rotate randomly on individual Z axis at all. The Random Rotation group does not work and I can't figure out why.

If I use Curve Line as Instance, without Trim group, I can create Arcs and then Rotate them randomly, like this:

But I don't get the individual height trim. It looks like this:

I have tried different combinations of the above and I am stuck. Is there a specific step that I am missing? Any help would be much appreciated.

Here is Blend file:

Answer 1

Your mistake is then you convert to instance, you convert all separated pieces into one big instance. Instead, try following:

You can rotate this blocks by tilting the curves and change height by scaling it:

I've also used capture attribute to make a random value generated per spline