I revised the fin design a bit where the cargo strut rods attach to the fins. Basically added an internal piece (that's not wood) that is sandwiched between the plies of balsa. This should spread the forces out and prevent any shearing / tearing through of the balsa. I may use plastic for the insert since the code says using metal fins is verbotten... kind of a gray area, since it is a metal piece, but it isn't the fin itself. All the bolts and bolting plates add to the "Steam Punk Look". I'm thinking Spar Urethane for the fins, and then faux rusty-crusty paint for the rest of the rocket.... except for the sacred Mercury capsule... which needs to look historically correct.