Like DrBeast said, subs textures are in data/submarine/(subname): for example NSS_Gato_T01.dds and NSS_Gato_T02.dds are main tex for early war and late war, conning tower textures are in data\textures\tnormal\tex: NSS_GatoTower_T01 and NSS_GatoTower_T02 (they all have NSS_ in its name).
Hull: NSS_Gato_T01.dds
NSS_Gato_N01.dds - normal map
NSS_Gato_O01.dds - lightmap
The same with conning tower textures, but without normal map - it seems sh4 doesnt use normals for CT.
You wont be touching lightmaps, but the more detail you put on a texture (rust and so on), the better normal map will be generated from it; you can compare normals generated from stock textures with normals from some downloaded sub skin - stock ones are much better. The drawback of stock textures is they are too small, there is a lot of detail on it but its pixelated too much and simply resizing them to 2048x2048 wont do much except eating GPU memory. 2048x2048 is probably best res for sub textures, as the game uses only this one texture for whole hull (unlike sh5), and even if you do 4096x4096 tex the difference in game will be minimal (again, waste of GPU memory).
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