Hello ebmar!
A friend of mine could upscale the low resolution textures that come with the mod as a personal favor to me but he can do it only if you haven't embedded into the .tpc files any custom .txi file because he needs to convert them to .tga and that information would be lost. Of course, it would be alright to have the .txi file you may have created but if you didn't do anything of the sort, he will proceed with the upscaling and if you like, you could release a new version of the mod with HD textures.
Cheers!