Bonus! ;)

Profiles are just Voronoi by Max Smirnov
Function Boolean Isect + native Hidden function "ExplodeMove"
(so just Press Tab then write ExplodeMove or make a ShortCut with the same name)

Of course if you want an "Inset" structure just make that!


The explode move gives a funny result but you must make another little trick for use this structure above!



The little trick... (of course the Cube B is closed! )
Take any volume smaller than A
Maybe there is another tip but this one works fine!

Above Free Kitbash for free MagicaVoxel by Hifoo
Not reasonnable to input the entiere modules (15 above) inside Moi! (_import OBJ) and no need to subdive here...
Faces are triangulated so use Blender first for have something like NGons...just stay very few "triangles"
And some pieces are really detailled!

Here just 2 modules (2 minutes for importation)