4x 512² simply means this: 4 separate textures, of 512x512 pixels, 1 cream, 1 blue, 1 grey, 1 with the blend map. Not a 1024x1024 (1024²) because then you could not tile the different materials which is what you want. How about the bottom? I think you could easily knock off about 1000-2000 tris if you cut the chamfers on…