RE: 4*120 Biplane Kit Bash?
I'm thinking of doing something similar to one of my Senior Telemaster kits (95" version). I figure adding a bottom wing would make it look something like a squarish cabin bipe of the Thirties.
While it would be more efficient to reduce the thickness of the wings in a full scale aircraft, because we modelers fly in a rather small place where building up speed only means that you have to turn sooner, I like my models to be draggy. Leaving the airfoil stock permits me to use the existing wing ribs, etc., which saves me money and aggravation. I tend to add drag to my models intentionally. Lots of drag also means that it is easier to fly from smaller spaces.
Ed Cregger