Quote: "supplement your own meshes named as the TGC ones to produce and odd debris shape"
Loc, your suspicions are correct, you can add custom meshes for your own debris through supplementation of the TGC ones BUT you will have to put them in place of an already created entity,
IE, instead of replacing the cylinder meshes with your new ones, I think you'll have to replace the cylinder itself with the model you want to destroy.
I don't know if thats very clear, but if you want a longer conversation on this, post back and I'll try and make more sense...
I've been scripting my worst fear for the last 2 hours, I'm a bit messy right now.!