Peter,
I suggest the easiest & cheapest option is to replace the bottom of the original tank . This is usually the problem area of the tank due to internal corrosion and impact damage.
This has been done many times successfully here in Australia, without any problems, even over a period of 20 years plus.
Unfortunately I can not suggest a alloy fabricator in your area .
To fabricate a new tank to the same design would be a major job and I assume very expensive . Then it might not fit correctly .
Geoff
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