I knew you weren't going to eat that goonch! lol
But seriuosly, my concern would be the cost to run such a huge setup. Say you want just 2 turnovers per hour, you would need an 18,000GPH pump (or multiple smaller pumps). That's going to run anywhere between 1,500 to 2,000 Watts! Not sure what you pay per KWHr (I pay $.30/KWHr) so running 1,500 Watts 24/7 would cost me $325/month and if it's 2,000 Watts that would cost me $432/month. It wouldn't be so bad if your rates are closer to the national average of $.11/KWHr, but that's still easily over $100/month...just for water circulation.
If I were building something this large, I would look into an air driven filter. I can't remember where I read about it, but I think it was a stingray breeding facility in the UK where the guy was using large air pumps to move water through his filtration system and he was able to achieve good turnover very efficiently...and most importantly, his water was nice and clear.
I know you are in AZ, but I would think that from November through at least March you would need to heat (depending on what you keep). Are you thinking heat exchanger off of a hot water heater? If you go through with it, make sure you insulate the crap out of the entire setup. I think if you just pour straight concrete with no insulation, you will lose a ton of heat through the bottom.
I would love to see you build this thing, but I would reach out to some of the guys that have systems this large (JohnPTC, Arapaimag, etc) to get some monthly operating cost figures and definitely look into making it as efficient as possible so that it doesn't drive you into the poor house.