I moved all the msh's, tga's, and odf's for the Naboo buildings to the world file in my map, and I started to reskin the tga's on GIMP. After that I put the object ingame and the textures won't showup! What did I do wrong? What are the steps I need to do?

When saving in Gimp make sure the RLE compression box is unchecked. You can open the modified texture and do a save as to the same name jsut say yes to overwrite