The design was done in CAD I presume and FEA of the stresses etc would have all been done and I would think it is possibly over engineered to account for home build and other discrepancies such as weld penetration etc.
Someone more in the know with CAD expierience and an engineering background will be able to help and possibly give you some idea as to what you could present to the tester to persuade them otherwise.
Good Luck.
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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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