Noodle Cower: Create >>>1<<< 512x512 Texture and make a Mesh with Plane Layers. Sample:

Create now additional >>>1<<< 512x512 Texture. This does work as Lightmap Texture.
Ok its more than 1 512x512 Texture but this is not teh hell. You can use these Texture on a 8000x8000 sized Terrain: Use UV Reapeat :P

Create now additional >>>1<<< 512x512 Texture. This does work as Lightmap Texture.
Ok its more than 1 512x512 Texture but this is not teh hell. You can use these Texture on a 8000x8000 sized Terrain: Use UV Reapeat :P