Making a car difficult to steal
Good ideas.
I know that no matter what you do it call always be stolen, the trick is to make it undesirable and encourage them to look for something better to steal.
One of the reasons I like Dusters is, they aren't E-Bodies. They shouldn't be as likely to be stolen, but maybe that is changing. Sounds like 2 A-Bodies in my area recently, makes me nervous.
So, do something to encourage them to go elsewhere (no steering wheel, or something similar), rig up something that disables the car so it wont roll, and add something to it so that if it is stolen anyways you can track the car.
Nothing is going to be perfect, just do the best you can.