RE: F-15 for MW54?
Absolutely no question, Avonds is the way to go. I have a Ram 750 (17-18# thrust) with a bifurcated thrust tube and I converted mine to an E-model (two Seater), 21# dry and flies great, plenty of power. The old DF versions have been built as light as 13 pounds. Build it light and you won't have any problems at all.