I have plenty of 30mm tornado fans, which is what I mounted. There is a bolt on mount for a 40mm fan, but I just sticky tape mine
I am using reedy 5000 packs, but just about any full size 2S hardcase will work.
Can't go wrong with a futaba 9551 servo. But if you are on a budget, check out the powerhd Titanium low profile servos. The flysky controller is.....You'll get what you pay for. The futaba 3pv is nice. The futaba 4pv is even better. Controller is typically a 1 time purchase. Recommended you do it right the first time.