Procedurally turning a 2d image with curves and lines into 3D using Geometry Nodes

I’ve previosuly been given some tremendous assistance and now I’m back.

I’m working on a “LED on acrylic” light display visualisation tool and I’ve got my model of the location.

I have 4 series of “acrylic” sheets with 4 different mapped images of colored lines.

I want to now turn these lines into a neon-esque lights, and thought I’d check some guides for turning 2d images into 3d. I’ve got something, but it’s not behaving as intended. For instance, when adding a Set Material at the end of the chain, it colours the full “acrylic” sheet (a 2x2 plane which has the image drawn on top of it).

Any clues what I am doing wrong? There’s also something iffy with the Add in the beginning, I had to put negative values for it to not be “in the way”.

The penultimate goal is to be able to import images that represent neon lights, and which can be procedurally turned into geometry with applied materials directly in Blender.

Thank you for any assistance.

No ideas on how to move forward, turning a projected texture onto a plane into a geometry?