Hey Dave ,
AWesome plane. I scratxch built one from plans 86 in. span, weighed 23 lbs flown on two OS .91 surpases. Flew awesome and fast. I originally had 2 OS 91 two strokes and had problems with the engines running. My first 5 flights were all on one engine. This plane flies very well with one engine out. We joked a lot about me flying a big twin on one engine all the time. Good luck with it and keep me posted. I may be assembling one of these for a friend of mine.
God Bless,
Fred