export the coning model using S3D, open it with wings3d (tutorial on
http://www.davidbrinnen.com/tut_wings_3.html) unfold, export the map, import it in photoshop, magic wand between the shapes, copy paste on new layer, pour black paint between the shapes in effect creating a mask, add layers of textures between the 2 to fill the different parts, including one with your logo (see the jap flag on the pic above), save as tga, re import the new 3d map and the image in the .dat file, and that's it !