Dear Kamineni,
The approach implemented in the structural modules of FAST (ElastoDyn, BeamDyn, SubDyn) is different than the approach you are describing, and I’m not familiar enough with the details of the approach you are describing to comment.
Regarding airfoil properties, I guess you are asking about a detailed composite layup. There is some discussion about this for the NREL 5-MW baseline turbine in the following forum post: Structural design of the wind turbine blade (particularly Brian’s post dated Jul 08, 2013). You’ll also be able to find realistic examples of the composite layups for wind turbine blade airfoils in the archives of various sectional analysis tools e.g. VABS, BECAS, NuMAD/BPE, PreComp, etc.
Best regards,