There is no relevant sketches in KiweeTwo - next Kitewinder product.
There are two sketches here:
Maybe you are referring to one of the two sketches. My opinion: a large frame is required to hold the two rotors, which adds weight, cost, and complexity. And all this is on the paper. Kiwee is in the real world.
For Kiwee’s rope-drive transmission, the right angle is essential, otherwise the transmission does not work.