zombies and barracades and better breakable props

Has anyone scripted a way to allow zombies to break through barrades? Like breaking through welded props or wooden bboards by attacking them?

And a better system for the breakable.props.tool? Especially one that Stuart in the advanced duplicator?

Onslaught did it by making a new prop entity, and then checking to see if there were any zombies around it. If there were, it would damage itself. It uses npc_bullseye to make zombies attack it, but it doesn’t do any real damage.