This can't Works ?


_Voronoi >Erase Points > Select All> Plane > Trim > Select Edges > COpy Move them somewhere > Join > Delcorners>ExplodeMove.

ExplodeMove is an hidden native function of Moi !
Press TAb and write ExplodeMove (or shortcut).

Delcorners round all curves, edges, open or closed! By Max SMirnov
http://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=e0b831b84d935e19e0aee0c5601136fd&filename=DelCorners.v.1.0.2015.09.09.zip

So you have your round VoronoI forms diverted
Put a plane with any form you want around the VoronoI forms
Boolean DIff = you have a plane with holes
Select holes
Extrude them with Taper option (or make a Revolve with a curve if you want curvated walls )
Boolean Union with Plane (erase tops)
Fillet if needing
That all! :)