The outer half is just a giant wing-tip, increasing efficiency but not producing lift.

It would need half the turbines to turn the other way around to have left/right wings, doubling tooling cost for production.

And it would need a runway of appropriate width, but maybe they could be mounted at significant v-shape.

Return trip not on the ground. The fuselage, engines, ... would still be massive, but with a set of small "normal" wings.