We propose a time-of-flight polarized GISANS study on mesocrystals of iron oxide nanoparticles in order to elucidate the magnetic dipolar interactions in orientationally aligned nanoparticles.The long range ordered mesocrystals under study consist of monodisperse maghemite nanocubes with edge lengths of 9.3 nm and 11.1 nm. First polarized GISANS test measurements carried out at D33 reveal a large amount of reflections that are resolution-limited in their FWHM.With the proposed experiment we will exploit the time-of-flight mode at D33 in order to access the depth resolution of GISANS without variation of the incident angle and at the same time increase the Q resolution onf the experiment. As a result, we expect to gain insight into the dipolar coupling in long range ordered arrangements of orientationally aligned nanoparticles. This study will be a valuable asset to our ongoing TISANE studies towards the directionally resolved magnetization relaxation in maghemite nanocubes.