First of all Love this thread! Another idea it's on a pos military surplus blazer I got its simply a chain welded to the floor or seat bracket and it wraps around the steering wheel with a padlock
Do you know how long it takes to cut a steering with a hack saw or a portable sawzall, 20-30 seconds and a hack saw is quite.
If you contact 12-volt guy he will give you some ideas on anti-theft stuff. He will not post it up on BB's because then the whole will know.
http://www.12voltguy.com/home.php