We decided to use a carbon/titanium hybrid fuselage after encountering structural limitations with a full-carbon construction. In the front section, titanium is a better solution because it is significantly stronger. The connection between the front wing and the mast is difficult to make sufficiently strong using carbon alone.
The carbon rear section adds extra stiffness without increasing weight. The high-modulus carbon used in this area is actually stiffer than titanium, allowing us to save weight while increasing stiffness compared to a full titanium fuselage.
This combination provides a clear advantage in rough water conditions. The rear wing angle remains stable and correct, regardless of the loads applied to it.
A full titanium fuselage would be easier and cheaper to manufacture, but it would also be heavier, and the rear wing would have more elasticity.