Hi Group,
Just thought I'd pop in.
CoCreate Modeling Personal Edition (PE) is worth a try from PTC makers of Pro-E, they say the PE is free but I don't know if they mean, 'for free' or free download,
you have to register to find out. Anyway to come to the point, in the feature list they mention 'Advanced shelling' so when I have time I will investigate.

Cheers