How to simulate a "stereographic" 3D model from the MagicaVoxel rendering engine?

Retrieve the "straight" OBJ object from Magica, better to clean up the coplanar faces with your favorite 3D program, project it onto the volume of your choice (here a half-sphere). The object will then have a thickness, and will be completely "3D Printable". It is funny to see that a "curvated" building becomes curiously a spaceship!

Once again the free"Kitbash" free is full of infinite richness of possibilities! Bravo to Paul Riehle / hifoo!