Rear Firewall

Fish,
because I will be putting the batteries in the trunk, and I will at least want to take the finished car to the track to time it once, either I build the fire wall or put a cut off switch through the back sheet metal accessable from the outside of the car, Track rules. Because of all the electronic systems planned for the car, giving someone the ability to walk up to the car and turn off the power is not in my plans.

Besides that, I will be putting in a custom fuel cell with an in tank pump accessable from the trunk. There will be fuel lines in the trunk and other electric devices. The potential of explosion, however remote exists. A vehicle the likes of that we are all building should be looked at as three seperate isolated and protected compartments.

In contrast to say a pro-stock funny car which is looked at as one compartment for the sake of weight. They take for granted that fire will sweep the entire vehicle and so they put the driver in extraordinary fire protection gear, as well as an on board fire suppression system.

I also have an electric powered/manually triggered Halon system with three heads planned for the car. I will as well be treating the front fire wall as the real thing, by closing unused holes and passing wires and the such through bulkhead connectors filled with fire caulking. I know this sounds extreme but the safety of the family and or guests riding in the car is at the top of my list.

RJ,
your way will be fine.
I don't know what the weight comparison between 16ga and two sheets of 24ga is. I know that one sheet of 24 is too lite and that's what I had free access to, as well as the 3M insulation. Thank you for setting an example of safety in such a great build.
Andrew