You could use 25 x 3mm flat bar around the tank and put 2 25x25 angle on the ends and bolt through,agricutrural but strong. 
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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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