[vettestr]

I bring these items up as a reminder of things that are easy to forget or you may not have known are available at time of your build. Some can be expensive and granted may be overkill in some cases. Just food for thought and a reminder they are available, up too you if worth the deviation from originality in some cases to ?? of modification in others. Can you hear the names Pinto and Chevy truck saddle tanks to Crown Vic's in the background?
Several choices are available for your GAS TANK that range from a donor OEM metal tank through Certified fuel cells placed in metal containers. Then there are several other devices that react to a collision, turn over and so on. Proper venting and vent location of that thing you store gas in should also be considered.
I am sure in this quick note I am forgetting some myself, what have I left out from the short list? These cars are not Child Proof and should not be but many of these are cheap and easy.. others are not. It is your ASSP.

G sensor or impact sensor = disconnects electrical on impact
roll over sensor = disconnects electrical
roll over check valves = mechanical block of fill and vent lines
vent location = place fumes are dumped so no build up of fumes possible
metal or shielding on fuel lines = to slow fire or abrasion
master kill switch = master elec. off switch to remove battery from system
cell/tank location = is sealed bulkhead between cockpit and cell, location
if impacted, tear or crush protection, others?
THE BIG ? is =cell, OEM metal tank, fiberglass tank, bladder, protected outer container and the options go on........