i think since you are probably planning to use this plane for all 3D purposes, to move the ESC behind the motor where the airscoops are so you can get better cooling, also very important remember to open the hole in the back of the plane so the hot air can go out. Rigth now in the position you have it, im not sure if the ESC will get enough cooling, remember you are using a 35 esc and you want it to be cool
, funny thing is, the castle 25 worked awesome, but the 1.5 amp bec is what gave me trouble it seems, so if you have one of the new castle 25 with 3 amp bec, that will probably be enough esc for it as long as you stay with 12x6 prop.
Daniel