Yes, all the configurations are difficult to implement, including this one with rim-driven generators aloft.
Things are far easy when the blades rotate with the inner ring, just like TRPT Daisy, with generator at ground. A variant (which also would be the sequel to the first Daisy design with a buoy as a ring), with helium or hydrogen inflated torus (ballute) carrying the blades, is described, allowing to scale in range and in diameter: Rotary ballute-based kite.