You need:
1) A painting program (Photoshop or Gimp (Freeware))
2) The texture map of a helmet
3) ZModeler 1.07 (better than V2 for such simple tasks
Procedure:
Paint the helmet in the texture map with the painting program. To check how it's looking, open ZModeler 1.07, load the z3d file (if available) into the program, or if not try to import the .gp4 file into it. Then press 'E' to open the material editor and allocate the textures on to respective mesh parts in the list. Be aware that ZModeler only can handle .tga files, along with the usual .psd and .jpg. NO .psd files! You'll have to save the texturemaps as .tga files in order to allocate them in ZModeler. TGA can't handle layers, however, so make sure always to save as .psd first, and then export it to TGA, if you want to work along on this file later on!
GPGSL : Team Owner of 'Maverick Track Performance' (MTP)