Trying to make Toon Shader Material on UE4

Thanks! This really helped! But how do I extract the Hue & Saturation from the Emissive Specular and Emissive sky? I see that the sky works in your screenshots, have you already made a workaround? Do I need to hook up something to the Depth Buffer to extract the Hue & Saturation? If so I don’t know how to do that:/ Could you help me fix this too?

I really appreciate your help so far:) Thanks again.

Btw: Here’s a screenshot of the results of my shader:


Here’s the cel texture I’m using: