Thanks Ian did contact them,

Some one suggested 20 mm poly carb and a slam lock mechanism.

It seems my idea of having a hole in the door near the top so I can shoot back while locating them on a monitor in the passage is illegal and will get me locked up for premeditated murdered, because my life was not in danger while they are attempting to break down the door even if they are using axes and 14lb hammers. Found this out because someone I was talking mentioned that his mate was in jail because he shot a friendly through the door while he was chopping at the door with an axe, his life wasn't in danger while they where attempting to break down the door...only in Africa