I presently have two twins flying. My Britton-Norman Islander has been flying seven years now with 149 flights on it. It has a 114" span, weighs 31lbs. and is powered by two G-23's. The other twin is a modified Goldberg Sr. Falcon scratch built from an original set of plans. It has a 81" span and is powered by two O.S. 40 FP's. I also have floats for it.
I'm just starting to build a Don Smith B-17G with four G-23's.