I think you are talking about the first sketch without the kite (the second sketch being an adaptation of the FlygenKite).
It may be advantageous to be able to stretch the central beam, or to make it thicker and in the extension of the two Flettner balloons on the sides, but at the cost of a loss of performance of the central VAWT.
Therefore the proposed solution of a (static) kite on each side would be a good idea to carry out for very large units. In the other hand that could solve the lift issue (if we don’t want use hydrogen or helium) but perhaps not side stretching.
