> I marked this WIP, but I'm not sure that it is .. I've kinda reached the 
> end of my texturing knowledge.

I think the HDR is a bit wasted on your image. If you want to use
it for radiosity lighting, you should give the surrounding sphere
a high ambient value such as finish {ambient 1} (you still need a
normal light source to avoid splotchiness, or look for the light
dome macros by Tek or Trevor G Quayle) in p.b.s-f).

If you want to use it to improve the look of metallic textures,
you need to give them a higher value for reflection (0.07 is not
really very much), and make them smoother. Finally, the scenery
could be rearranged to show more interesting reflections.

I attached a sample render of your scene with ambient 1 for the HDR,
light + HDR rotated by 90*y, and the texture modified as follows:

#declare Chrome_Texture =
texture {
     pigment { rgb <0.658824, 0.658824, 0.658824> }
     finish {
         ambient 0.0
         diffuse 0.1
         reflection 0.6
         brilliance 2
         conserve_energy
     }
}

#declare Chrome_Metal = texture { Chrome_Texture }

#declare Brushed_Aluminum =
texture {
     Chrome_Metal
     normal {
         bumps -0.02
         scale <1, 0.005, 0.005>
     }
}

It still doesn't look convincing but it may show how to use the HDR.

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