Well, looks like you're up to your eye brows!
Great job, so far. You've been doing some very clean work.
I really like your overflow design! You gonna use the whole 1000lbs of sand?
If you don't mind - let me know how you like the AquaSurf. Oh, and tell me as soon as you get your AC-III on line - I'll send you a copy of my little prog. It'll do real-time graphs now.