What advantages do you see from using two batteries? My Privateer is using a very similar power system, but the 10 gram motors are 2000kv. The six gram 6 amp esc I believe are manufactured by HobbyWing and they have a soft start setting that works nicely with the small motors with high kv, but I found it easier to use the programmer to set them up. It cranks pretty nice with a single two cell 2200kv battery, but there are 1300, 1600 and 1800 mah batteries of the nano tech chemistry that will be tried to see if they can hold up with the four motors drawing on them. The lightest one that can not sag too bad will get the ride. My preference would be to use retracts. I finally went with the 18.8 gram electric retracts from HobbyKing. They are inexpensive and so far have not given any problems.
Have you thought about the color scheme?