Initially @tallakt proposed a large version of a TRPT, using spacers like “spars of david”. I think also @Rodread rather envisages a long stack of relatively narrower rotors.
But this topic being about rotating AWE systems in general, other methods like flygen or yoyo or other can also be investigated. As some advantages like an easier control and a lesser space use can be expected we could try to study how such a large rotor could be built then work. Some possible questions are: could a thin ring work at this scale (is the expansion of kites still working)? Or are rigid connections required between the kites? Is there other possibilities?