I must say that this what you made is definitely a nice skin. I love the theme and everything, but I'd actually suggest you to remake this skin to fit another frame, and I would probably go with Vauban.

The helmet alone is beautiful, a really nice concept, and trying to publish the helmet alone would be a good idea. But, if you don't make it, I suggest you doing a Pretech concept for Vauban.

And besides that, Excalibur really has a ton of alternative helmet and skins and new Vauban skins would be really appreciated.

Good luck with future work!