I saw this a while back and became very interested in it. It has counter rotating blades so no tail rotor is needed to compensate for torque.
I am in communication with a gent in Belgium who is building a "backpack" helicopter. I'm trying to gather as much info as I can before starting construction. There are no plans.....just pictures. I had a Scorpion 1 heli back in the 80's. Repaired it but never flew it. This as you see is simple, it works, and no license is needed to fly.