About this 3D model

I've remixed the base of this Quadcopter (http://www.thingiverse.com/thing:288932) which is based on the Spidex Micro (http://www.thingiverse.com/thing:326062) to allow for different motor sizes. I'm always frustrated whenever I print out a base and my motor holes are off and need to constantly drill out the base to try and align the motor. 23/6/14: Tested this out on the weekend and works well