Yes I too have admired Ken Wallis work with the Autogyro.
However I am not able to understand why he has not tried to market these machines to the civilian market. He has made statements in the past inferring his machines are superior to all other gyrocopters, which I have no reason to disbelieve. Then why are his plans or machines not for sale? If am not mistaken.
If I had a hangar full of those goodies I too would want to keep them if I could afford too but would let the secret out how it is done.