Kill Switch, McGyver Style anti-theft Options

[VavAlephVav]

So my Brother has(had) a nice phat 2001 Ram diesel with four-doors and dual rear wheels. Just made the last payment on it 2 months ago, and this weekend went to the summer Rockfest and it got stolen from a pay parking lot downtown.
Retard Police wouldn't even let him fill out a report because he didn't know the tag number (had just got new tags), then when he goes to the dmv on Monday and looks it up he goes back to the Police and they tell him he didn't really need the tag to file a report... /smackdown
lucky the poor guy had kept his full coverage insurance on it. But this has got me thinking... cause I can see the edge of the bottom of my window trim is bent out like its had a slim-jim in the door before, and my driver window rocks a bit like one of the supports is broken.
but does anybody have any experience rigging some kind of a special kill switch you could hide up under the dash so that it wouldn't start unless you know where it is. mine has a factory Toyota thing that says security on the lower dash panel but IDK if it works

[Nihil]

I've been thinking about upgrading my cheap AEM alarm my own way (make my own alarm unit), with siren inside the cabin and car horn for outside noise. I don't think anyone here would steal a '97 Celica, but when I get a proper sound system, it might happen.

Good places for a killswitch I can think of:
- under the front ashtray (maybe there's room for a small switch)
- inside the rear ashtray (behind the arm rest)
- inside glovebox (a bit more obvious, but can be hidden quite good)
- under the dash (the most obvious, can be hidden, but probably the first place he'd look)