You can use v0.1 of my editor which I made a while ago to easily create convex hulls based on objects or parts of objects. (Among other Tokamak-related tasks...)
Don't expect much out of it beyond that and boxes though... Read the readme/release notes for more help. Sorry if it's a bit fiddly :) It beats messing around with Adjacency, though!
http://crumbsoftware.f2o.org/index.php?p=products/ape/I've also used that program for placement of information nodes on objects for interactive models with information about seperate points, but that's not important.