I might have gotten things messed up because I am not a medical student. Apparently the swap happens only for MRI and similar things where the picture swaps the coronal plane.
If you want the explanation for it search for sagittal and coronal plane. It gives you a way of talking about bodies independent of rotation.
Mind selling me on the dlc? Never played factorio but I am susceptible to automation games. Currently on minecraft create mod and shapez.