This upscale o' an Estes Orbital Interceptor is built with LOC 2.6" tubin' and an Aerotech nose cone.  Fins are 3/16" ply, me hearties, with t' exception o' t' tail plane (which is 1/8" ply).  T' tail plane is gussetted with triangular balsa stock and tabbed onto t' rudder.  Motor mount is 29mm, and can accept a 6-grain case.  This model can handle full-H motors reasonably, matey, but a small I would be t' limit.  Vinyl decals from Stickershock23.