If I'm playing devils advocate here, large tanks are much easier to manage apposed to smaller tanks.
Sam,
I like your thinking outside the box, and your attitude towards doing what hasn't been done, or at least doing what is perceived as hard to do. Obviously people are doing it, and the more that do, the easier it will become.
When I was very involved in the Cichlid world, I proved many times that fish said not to do well in captivity, could be kept. If you have the means and the passion to follow through with what it takes, I say go for it.
Just stay true to the hobby!