I would look at the design from this stand point.
What can I destroy with large caliber rifle weapons and small home made explosives.
What are the weakest points with the overall design.
Tires. Motor. Vehicle skin. Fuel. Glass. The list goes on and on from here.....
Bio fuel or a propane redesign for the motor... And the older the better IMHO no electronics too worry about is better in the long run for simplicity of keeping it in working order.
Tires get the honeycomb tires which are not inflated... Have 4spares on the vehicle.
Motor needs at least 1inch thick steel plates surrounding the compartment.
Anything I can break with a hand tool needs to be removed and reinforced.....
I wouldn't even know where to start, this was me just posting a
about this post because I like the redesign process but I can see where I would write a small book in this post lol.
Very cool post