3D Voronoi smoothed with naked corners

I am trying to turn this geometry

into this one.

(source: Dezeen: Fragile-Beasts-sculpture-made-from-paper-by-Lodz-University-of-Technology-students)

I am still struggling with:

1-avoiding the naked corners after the smoothing;

2-avoid the structure to be cut by a boundary box.

Any suggestion may be much appreciated!

sc