Mesh Apertures

Hi, I work in project inspired by organic forms, but now I need  generate some openings, with weavebird i got interesting results but I was thinking of something more random and less symmetrical, like voronoi patterns, attached is the file with my project(P), an image of how I wish to look(A) and a seccion of the actual proyect (C) (the apertures from the seccion are made in phothoshop ;), I wish I could control where openings are because they will not in all the mesh, like in the seccion...

any ideas or help would be great.

if no understand my bad english or the idea i can write it again jaja