So this is my second quad copter with 8–9" motor to motor distance. Now the structure is at least enough robust compared to first one
Darker side is the weight of ≈400g with 3s 1000mAh battery. At this moment I have HK 18-11 2000kv motors with 5x3 and turnigy Plush 6A ESCs measured current draw at full throttle is only a hear over 6A w/o flight control board 
So I hope that this one is not to heavy for those little motors and that the current is not to much. Now I'm waiting new Arduino because I managed to burn last one when I try to remove it for installation to new PCB 