Intuitively I wouldn’t choose that shape as I would guess that the torque you can transfer is limited by your minimum R . What do the forces look like if you made it like a tensile downwind rotor with the bottom, lowest radius, node rigid (which it perhaps has to be to connect to a generator) and that marking the bottom of a truncated cone/funnel? At the top of the funnel would be your kites.
This reminds me a bit of space nets (Conrad Roland) Video testing forces: HowNOTtoHIGHLINE