Depends on the model. Some models are offered as full-kits (all wood) and short-kits (just the shaped wood parts). Each kit has the parts listed or a link to a .pdf file that shows the parts. In the case of your Banshee, you can choose from four different versions (including a foam-core wing/stab). I do see that the wing and stab ribs are listed separately for $20. May be worth an e-mail to Don at Eureka to ask if the cut ribs come with the wood wing version or not.

EJWash