if you wonder what I mean by "the gas tank which is inside of the frame", this is what I mean
the frame is stamped sheet metal as well, so it basically can't be cut without ruining the integrity
my only option to keep it in stock condition (which I should because it's over 40 years old) is to basically make a new gas tank inside the existing one, without removing it
I would basically need to get a flexible tube of some material which can handle gas, put it through the inlet and outlet of the tank, and then blow hot air through it until it's reached a reformable state where it will retain its structure once cooled - then squeeze the tail end shut to make it take the shape of the tank
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