Yes, I know exactly what you mean. The fus builds somewhat like a Guillows rubber powered model. I'm going to scratch build new wings using the Goldberg Ultimate bipe airfoil. What does yours weigh? I'm looking to get mine down to 8 lbs. I eventually will be pulling a new mold from the cowl so I can make one much lighter. Other then that everything else is stock outline but with lightening holes in all the bulkheads. So far a pretty light build.