Ron, Ron, Ron....when we dream, we should dream BIG....like a 1K gallon for $1K 
I could only see doing that if it was acrylic!
I was at an auction earlier this year that had a 12,000 gallon water storage tank. I was this '||' close to buying it for cichlids, but I couldn't figure out a good way to get the fish back out of it since the lid on top was about 7' high and 18" round, while the drain at the bottom about 2"-2.5". Too small to climb in and too small to drain them back out.