That's... erm... complex. I'm still struggling to develop some decent technique to generate bump maps, and those bump maps are absolutely critical on larger objects to get a good result. Repainting something is only a part of ships, for example, the caps are using almost the same texture sizes (2048x2048 ), and also, they don't use tiled textures. Tiled textures are a lot more easily to handle. Also, it'd need to adjust the LOD textures. Currently i'm using only a single layer in the textures, the vanilla models have up to 15 different ones, but unfortunately the program i'm using isn't able to handle layers with different sizes as a volume map.