Yup, that is big! lol And heavy too... 1000 g.
That pack should provide more power than you could ever use... I like it.
I am running twin 3s 4200mah G3 packs in my racing revo and they are wicked. I feel like throwing my other 25C enerland based packs away. They feel like a 6.5s pack compared to the enerlands.
Nice build.