Hey Michael, the strategy that I use to create this 3d voronoi, I must give the merits to Gabe Smedresman, long time ago he developed VB script to subdivide breps geometries, what I did is that I create random points in order to create a volume that could contain this points, (in this case a box, but the volume could be whatever you want) , then I just introduced the data to the vb script component, resulting voronoi volumes. From this point I only classified the data in order to extract the lines to create the structure. Also from this data I used a random selection to extract the volumes that should be solid. If you want the vb script component I can send it to you.
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Hey Michael I was thinking on how to remove volumes from the perimeter so I got this definition hope you enjoy it
http://dl.dropbox.com/u/22447145/2011.04.rar