Very complex transition methods. Why not pivot the cabin/compartment in the centre of a frame with engines left & right or fore & aft, and have the transition of rotor alignment to cruise achieved aerodynamically by the changes in rotor cyclic & collective, rather than physically? This would mean a much simpler hanging/bearing arrangement for suspending the cabin.
The transition of the cabin position could be partly achieved by a controlled/damped/assisted use of its own CofG, in hand with small wings/canards for returning from cruise at speed.
This would of course mean siting the whole power and transmission system remotely from the cabin area, maybe in a separate enclosed aerodynamic compartment.