Thanks for sharing, this looks really nice!
Blender file format is not a data archival or exchange file format. There is not even a formal specification of the this file format, it is subject to change any time, any way without notice, it is just whatever is currently implemented in Blender (very much the same way as Slicer’s scene file format). It would be important to make the models available in a standard file format, such as glTF, PLY, OBJ, or even VRML so that it can be used in other software, such as Slicer, OpenAnatomy, OpenSim, …
For example, we could easily import the atlas from any of the standard file formats into Slicer (but not from Blender), including textures, and register that to real patient images, even with non-linear warping. Or, we could edit the atlas to be able to create models from the most common normal and pathological variations from patient images.