I will give an overview of the simulated data our SFB projects will be based upon. I will present the main characteristics of earlier numerical zoom-in simulations of Milky Way-like galaxies in concert with their main findings which agree with some observational constraints of our Galaxy. Particularly, I will focus on the Auriga and NIHAO projects, which have provided a landscape of the numerical modelling of Milky Way-like objects. Then, I will give an overview of the TNG50 simulation, the smallest physical volume simulation of the IllustrisTNG project, that will bridge the gap between zoom simulations of individual galaxies and large cosmological volumes. I will illustrate the practical starting point of the project and how the TNG50 outcomes will be used. I will hence focus on structural properties of the simulated Milky Way-like TNG50 and TNG100 galaxies, providing a preliminary comparison to Auriga and NIHAO's outcomes.