Hello Steve,

>> Have you ever looked at the "power solids/booleans for Rhino" from Npower?
>> http://www.npowersoftware.com/rhino/proverview.htm just curious as that includes shelling

Yes I did try their plugin in V3 and then their shelling was hopeless !!! but that was before I actually had the need
for offsetting a complex polysurface for our water cooling design....there are so many apps available now with more
control on shelling such as different applying a different thickness to an area but not all...

ViaCAD looks interesting so far ;-)