Layer 1 ( View Image )
Create a normal gradient fill.

Layer 2 ( View Image )
Apply Filter -> Render -> Clouds and set the layer to soft light, opacity 25%.

Layer 2-5 ( View Image )
Importing two different views of the model, Apply filter -> gaussian blur: Radius 5. Also added some lighting to the left model using my architecturak lighting tutorial.

Layer 6 ( View Image )
Using Airbrushing tutorial add "wings" of airbrushing to go behind the main render.

Layer 6,7 ( View Image )
Import the main render and duplicate the layer on the first layer apply Filter -> Blur -> Gaussian Blur radius 10 and set to multiply to add a shadow.

Layer 7-25 ( View Image )
Using the architectural lighting tutorial add lighting to the underside and uppersides of various "blocks".

Layer 26 ( View Image )
Duplicate the original gradient layer and place it over the top of the image, then erase the center so the sides are slightly faded as above.

Layer 27-42 ( View Image )
Importing the three views of the craft model use the architectural lighting tutorial to add engine lights of blue and red, also add airbrushing with motion blur to work as engine trails.

Layer 43-46 ( View Image )
Add small areas of red lights to the upper blocks apply gaussian blur, radius 3 and then Edit -> Fade Gaussian Blur to 50%.

Layer 47 ( View Image )
Using the architectural lighting 2 tutorial add lighting to the faces of the "blocks" and the side of the "bridge" on the left of the image.

Layer 48 ( View Image )
To add "over-clouds" Apply Filter -> Render -> Clouds. Then Apply Filter -> Render -> Difference clouds 5 times, and erase the bottom third of the layer. Finally set the layer to soft light 40% opacity.

Layer 49 ( View Image )
On the next layer just use Filter -> Render -> Clouds erasing most of the perimeter of the layer set to color dodge 20% opacity.

Layer 50 ( View Image )
Create a color balance layer with -44, Yellow on highlight and +5 blue on both midtones and shadows

Final Image