There is an excellent review paper on variable stiffness composites:
Ribeiro, Pedro, et al. "A review on the mechanical behaviour of curvilinear fibre composite laminated panels." Journal of Composite Materials (2013): 0021998313502066.
Regarding manufacturing challenges, I would refer you to the works of Prof. Gürdal in Delft.
There is an excellent review
There is an excellent review paper on variable stiffness composites:
Ribeiro, Pedro, et al. "A review on the mechanical behaviour of curvilinear fibre composite laminated panels." Journal of Composite Materials (2013): 0021998313502066.
Regarding manufacturing challenges, I would refer you to the works of Prof. Gürdal in Delft.