1000 gallons is amazing!!!! #GoBigOrGoHome
I'm super excited for you and more than a little jealous. That being said I feel compelled to make myself into something of a wet blanket, a damp blanket if you will... My concern is that a 1000 gallon tank is a huge undertaking!!! I know you have done your research, so I'm sure you know that (it could even be part of the reason your undertaking this challenge.) What I hope you will consider is that by starting so big you are in many ways locking yourself in. If you build a system perfect for large predatory fish it will most likely not be optimal for coral, I would go as far as to arguee that it would almost certainly not be. My advice is simply to entertain the idea of starting out with a smaller system (or two.)
I hope you don't take my advice because I want to see pics of a 1000 gallon build!!! Welcome to the hobby, your going to love it!!!!