Well, got these pics up finally as I promised.
Now, in the KOTOR games, we see that the helmet is flexable by the neck area and behaves like some sort of rubber or even spandex. Also in the game, they appear to be full metal helmets. Now that, I think, is what's most confusing and unreal about this. I've studied these from all available sources, few they are, but I know this is possible.
But the comic artists seem to have thought about this as well, and have produced number of versions, they are much more practical than the game version - they seem to be made for humans
Notice the visor area, and compare to the game version.
I put this one here to show how this might be put togather. Rare earth magnets for the mask?
And the last, it seems it's intended to be soft on top of the helmet itself.
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I hope this might help you, and may you forge an armour like no other has!