Its not a protective plate, its miles away from the prop shaft. Its just stepped back to give the driver a little more room for your feet and pedals. Making it out of 3mm is just going to add weight. If your in a collision that is so severe it crushes the passenger side of your car and forces the gearbox / clutch into your footwell...... well 3mm steel plate isn't going to save you from that accident.
If you want to make the prop secure, fit a hoop around it to the tranny tunnel.
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