Hi kevin, the funtana 90 is the next plane on my list with its 1000+ sq inch wing area it will hold even a ryobi 31, and if you convert it to gasoline/glow set up the weight savings are great a feather light engine without the heavy muffler is about 28oz so if you can replace the muffler with an aluminum one you will be right in the ballpark of wath you are trying to achieve. good luck
Aero Nut.
P.S. read the tread of gasoline glow plug no ignition page 4 and see what some converts are trying to replace the E85 fuel using denatured alcohol or pure methanol for that instance.