Thanks to Bushwacker!
At Denny's suggestion I modified my tank mock-up to the OEM dimensions Denny provided, and lo and behold, the mock-up fit first try.
So now, my theoretical tank capacity is up by 10% over my initial design. Might just make the difference between getting home, and not one day.
Here are a couple of shots of the modified tank mock-up. It is amazing how much cutting and measuring went into a basic trapezoid shape! Now we will have to see how much the extra surfaces and welds adds to the price compared to a rectangular shape.
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