But Intruder... why sheet the greenhouse area? I guess it would be a little flatter between the simulated window frame pieces, but not really that much so.

I ask because you may not want to add much weight behind the CG of that particular plane -- I shave the plywood fuselage parts when I build them, for balance reasons -- but then I also avoid using much more than a .40 size engine on .40 size airplane. The 2-cylinder 4-stroke .90 that somebody mentioned would sure make it easier to balance, if you don't mind that most of strength is going toward lifting its own weight.

Art -- I have a couple of photos from last summer's cub fly-in if you'd like them for comparison. I'd love to see how you treat the fuselage on your re-planning once you get that far. I was never 100% satisfied with how I did my little L-4, but it sure was pretty.