Based on literally the only photo Boeing (probably inadvertently) released to date, I think the fuselage shape is what they have been showing in the newer CG videos starting from mid 2017.
Since SB1 uses AFP, then that likely means all unidirectional tape material. One thing to consider is the damage tolerance capability of a high strain, ultra-stiff rotor blade constructed entirely of high modulus or UHM carbon tape. Even with modern toughened resin systems, it would be very interesting to see failure modes from typical ballistic threats or bird strikes