Density texture in Voxel to mesh? Hi ,

I am working on a scientific illustration.
This is a porous structure of a membrane.

How can I create the bottom part of the block? 
Can I convert the density voxel to mesh?
I've tried it this way:


Create bezier curves with bevel, convert to mesh, you have pipes.
Create a cube, Boolean it with the pipes.
Sculpt with Dyntopo to give it smoothness and bumps.
Decimate the mesh to reduce the amount of vertices. Give your object a Shading > Smooth.
Give it its surface bumps with a Noise Texture.