Thank you Dune, the structures are truly fascinating (can't get enough!).
The main base of the Gateway Nebula has been rendered with 3 Cloud Layers of V3 with 3 Light Sources embedded.
I use Denis Sirenkos method to render them. Mostly I use a few of the renderings and mix them together.
I just try out different methods until I end up with a good and pleasing result (see Screnshot with marked layers).
Screenshot Photoshop (The final Gateway Nebula consists of 4 different layers of different cloud nebulas)
STORMLORD