Mcalex everything that fits in the ES will fit and work in the formosa, however you will find you get better performance with a lower KV motor in the ES. If your going to use the stock motors, (and there is nothing wrong with that) stay with 2S lipo's as 3S will cook your motors in short order. I would suggest using ultra deans connectors for your batt and ESC connections
you shouldn't have any issues with things working together. I will post some links for you later with some pretty good deals on batts and RX
I for one think you will be happy with the ES