The inventor Peter Sharp himself made paper rotors of 25 cm span.
I was intrigued by this rotor and, using the profile reproduced in the original post, had two 50 cm span polystyrene foam models made, and two 60 cm span EPP foam models.
The results of the experiments were even better than those predicted by the inventor. It is true that these rotors are larger and perhaps the material allows a more stable profile.
Perhaps the efficiency would be even better with much larger rotors leading to a higher Reynolds number.
The small models could be lightened by being hollow.
This rotor combines a high lift with the possibility of aerostatic use, while having a more or less straight configuration facilitating their stacking.
To my knowledge no one else has had the curiosity to build and test them, while there are a few Magnus balloon projects that depend on spin motors that consume all the more as the inflatable balloons hollow out during rapid rotations (spin ratio above 2 times the wind speed), while the spin ratio of the Sharp rotor is of the order of 1.