Hmmm, the Barbutas aren't as perfect as your other helmets.
I used them ingame, and they have some issues with clipping and alpha maps, most likely due to their thin mesh.
Maybe thicken it up a bit, so that it's more than basicly just a texture with transparency, around the eyepiece and the bottom edge, that is?
Also, the lower edge of the helmets texture is a tad too dark in some places - The helmet doesn't draw shadows like that, and I know that with 100% certainty
You should be able to see what I mean in these pictures:
Note that I think that the helmet concept looks absolutly awesome and down to earth, but it's mesh really is a little thin.
The helmet itself could maybe be made about 2% smaller, or the eyepiece made a -small- tad more narrow.