I'm not sure how far off topic this will be - but what the heck, nothing ventured, nothing gained. Would it not be easier to just go through the textures one by one in alphabetical order? My reasoning is that so many of the textures are reused through out the game, you'd be restricting your effort to what needed to be worked on rather than having to repacking the textures by planet. (Trust me, I can see the other side of this but wanted to hear your opinion on it all the same.)