Saito 72 sounds like the way to go. What is the weight of this engine? Hopefully around 16~17oz or less. Also is this engine discontinued? The Saito 56 much lower in power? I seen a 56 on some other aircraft and it looks to have quite the authority powerwise.
Currently I'm going to scratch my own profile design with idea's from all the Morris profiles I've built in the past. The end result will be similar to the Aeron, fat wing, topcap tail like feathers,tall fuse (for knife edge) and maybe a thicker/wider fuse for extra rigity for the 4 stroke. All trying to keep the airframe lightweight.
You guys, you'll love your top caps. Fantastic flyers. Myself I've had one but am looking to try something different.
L8R