This was my first toothpick build and I ordered the Amax motors which has the 3 hole mounting pattern which only one screw hole would line up. So I ended up drilling out a 3rd hole in the frame. It works fine and has taken many crashes! Since the Happy model boards were having issues with the 5v regulator, I added a micro 5v step down converter to power the camera and vtx. I've flown over 50 packs with out any issues.