get bullet proof fiberglass and build fixtures over your windows. Get an electric motor to retract the fiberglass.
Put steel rods spaced out around your hood latch, so no one can cut it off.
Can you think of any other way someone could break into your car?
Other than that, get a cheap bluetooth device, which will enable you to use your carkeys to trigger the motors to engage/retract the fiberglass windows.
If you really think someone will grab a saws all and cut through your sheet metal, you can get an extra battery and run positive wires throughout your car's frame in a criss-cross pattern. If they saw through, the battery will short circuit, and the person will be electrocuted. You might want to setup a fire extinguisher that shoots in specific areas when the battery short circuits...because your car will more than likely catch fire.