The N5800 project now has all three fins attached to the airframe. The nosecone and fins use high temperature epoxy, the airframe is essentially a standard carbon fiber airframe. Now the challenge is to assemble the payload and recovery, electronics, and most importantly, to reinforce the fins substantially. The impression that I get is that the builder is planning to make extremely large fillets. This will surely test the strength of such a method to an extreme degree.