How thick would the polycarbonate need to be in order to not break when being filled with water? The dimensions of the tank would be 12 feet long by 4 feet wide by 3 feet tall.
That link can't be used as a go by really unless the tank is 8'ft in length or less. There are other calculator out there but most are limit the tank length. You can always double the glass thickness but there where the prices really jump.
why not use a 1000g (960) stock tank?
950g is $350 or so
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It;s a plastic tub/pond - that's why it's cheap.$350 for a 1k gallon tank in glass or acrylic I am sure would be wayyy more than $350. A stock 180g glass goes for about $900 in my parts. Make it acrylic and its at least $1100-$1200. Building a plywood tank would be way cheaper than buying a stock 1k gallon tank. The glass should be the most expensive part.