If you use the stock mount don't use self tapping screws. Drill all the way through and use lock nuts on the bottom. I broke at least two with a Saito 91 up front. The extra stress of the screws pushing on the plastic is too much. At least mine only broke during landing. It wouldn't have been much fun up in the air. I have at least 50 flights on the current mount without the self tapping screws. My only mods were a pull pull rudder, elevator servo under the horizontal stab and I reshaped the tail. Flys great.