What ever you decide and 3mm 1/8 are ok,still use Sikaflex/PU to glue it to the chassis.
I did this and used plenty of rivets and the car is raced and no problems,consider placing you seats on a strip of steel across floor and fixed to outer and trans tunnel rails for piece of mind and you wont find your undercarriage dragging along the road. 
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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