RE: I'll ask it here... Airflow over a BEC and Li-po recevier pack
I converted a few GP planes to EP and did not really bother to work on airflow as the current draw was not high, it worked fine. What is high or low is relative. Let's say you have a 60A ESC that is operating around 30A most of the times then there would be no issue. As for your packs I will say that if you are discharging them at a 8C then usually it will not heat up much. In any event its not hard to get air flow over the ESC, just mount it in front of the firewall, there will always be space there as your motor will be extended to clear the cowl/cowl cheeks. For the batt you can always make simple air scoops using spoons etc.