yes June did an excellent job with 3D !
I tinkered around in the visio 3D space too using a database backend to trigger move forward move back actions as shapes overlapped during rotation, albeit along a singular axis of rotation...
Visio seems to have the range of shape fill flexibility that I require, however the capacity to indent, push pull, extrude vertices and edges in a tri-axial environment, just doesn't seem to be there... nor as Surrogate suggests :- ever will be.
moving forward, if not Visio, what would be your weapon of choice ... Sketchup or Blender?