I though to just do the same as I'm used to with BMP files, but this isnt gonna work, since I dont get the right items on my page.
Let me show what I mean. This is what I normaly start out with:

Then what I do, is cut out the parts of the fuselage, paste those on a seperate layer and duplicate that layer, so I get 2 of those.
1 I use to give the new color and the other one for shading.
The colored one, I ajust to the original background layer with lighting effects, and the shading layer, I pull up the blacktone and ajust the transperacy to just give a little shade and highlight, instead of the full color.
I put all 3 layers together and save those to return to DXTBMP and this results in something like this:
You can see I got huge detail- and shading-effects and the color seems to come alive.

(I only did one part, just for the example)
However, with the DDS files, I get this to work with:

I got no outline for the fusalage, I got no shading to work with and just repainting one layer gives a way to flat color, with hardly any graphics for rivets and detailing. I get a flat basic color, which covers up the detailing of the rivets and all.
How do I create my color layer with only the fuselage parts and how do I create the shading layer from this flat surface drawings? Or how do I convert it to BMP, so I can indeed work with the items I'm using as in the top example?