Each motor is mounted via 3 screws hidden beneath the LED lens in the arms. The screws pass through the plastic of both the upper & lower shells sandwiching the two shells together. The shells are solid where the motor sits save for the screw holes & a hole for the motor wires to feed through into the nacelles. Being mounted to both the upper & lower shells means this should be at the least twice as strong as the P3 which only mounts the motors to the bottom shell.
Can some one show me how the motors are mounted?