Yes i packed the helmet folder, the Mod folder structure is correct.But it seems that the AddonBuilder doesnt binarized the whole Addon anyway but i checked the option for that.So, ill give it another try with a new Helmet and test what you said and see if everything works.
But big thanks anyway, i think i know now how to correctly put in new Gear, hope to get Backpacks etc working with that Proxies and so on.