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You shouldn't be changing the original game archive files, particularly FullBuild2 (it's uncompressed size exceeds the file offset 32-bit size). To do so is unnecessary to get what you want done.
Put the original FullBuild2.package file back. Put your modified images in a new .package file, using their original TGI values. If you haven't already, follow the modding instructions on how to get the game to recognize mods. Put your new .package file in one of the new directories, mod/packages or mods/test, and then run the game and look for your changes.
By retaining the original TGI values, your new images will replace the ones in FullBuild2 without changing the original (which will make your game unpatchable). When your new package is removed, the game will revert to the originals.
<* Wes *>
If you like to say what you think, be sure you know which to do first.