It worked quite fine, even for larger dimensions (such as [32][32][10][10]) but since I implemented the chunk limitation (which uses ent_remove) I get these nexus memory difficulties.
The 4 array dimensions were easy to manage when controlling the chunks and tiles: [ChunkCoordinateX]CunkCoordinateY][TileCoordinateX][TileCoordinateY]
But you made me aware of this beeing not efficient at all, as there are not more than 16 chunks á 9 tiles created at any time. So I try it with an one dimensional array. Thanks!