Damn bro, that's awesome! You're going to have a very large operation. To be a devil's advocate, I must ask why are you putting all your eggs in one basket? Why not mine other coins or do some GPU mining? Diversify your portfolio!?! You are putting all your risk into one coin and that may not be a good idea. There's no telling which altcoin might be the Breakaway coin for next year and as you may know etherium and litecoin have increased much more than Bitcoin this year.

Your difficulty increase estimates are very low.  10%+ every difficulty adjustment has been more typical recently.

Also you need to factor the horrible reliability of S9 hardware.  Expect to lose 5% of your hashrate each month.