There's no real "set" color for this.  You just have to fiddle with different combinations until you get something that works the way you want it.

I always used something between 150 and 200 for the gray, then (depending on reflection needs) between 50 and 150 for the alpha.

For that dayglow orange, notice in the picture that it is faded in certain places, so highlights and shading would be needed.

Also, the metal doesn't have a "polished" look, so you would need to put on a lighter gray with a low reflection (gray=175, alpha=150 or 200).  That should get the look you're going for.

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About the alpha... How do you actually change the value of it? Is there a setting in Dxtbmp or is it done through the actual editor?

Another consideration as to why a repainter has to be careful about setting *any* specific combination of grey/ gradient/ alpha, etc for "silver" is that it also depends on the underlying material that the modeller used.

A modeller may use a lighter (i.e. "whiter") material for some of his parts, and darker for others.  Using a set value of alpha an grey may interject unwanted shadings.

Another thing to consider is to slightly vary the alpha in places, so as to simulate the possible variations between sheet metal areas.

Success I see how the alpha works now, just a matter of painting the bloody thing first! (tip tanks are pretty much done, basic colouring of the wings, etc...)