RE: Gp Giles 202 25% mods
Thats one of the worst things you can do to this plane is make it heavy, I have an OS160 in mine and it flies great. But to answer your question, I would definetly fiberglass the center section of the wing, your gonna need it, and install your battery in the back of the fuselage. Add tri stock to the formers in the wing saddle area fore, and aft.
Daz...