This is the first time I have ever attempted to design a full sized plane. I am sure you can tell from the name, I am working on a back Country Bush plane. I have several thoughts and ideas for STOL performance. I am for the most part a Arm Chair designer, I don't have any engineering in my back ground, so if i ask dumb questions, please forgive me.
I have bought plans for a J-3,
Arkan:I am going to go the carbon fiber route. Use of honeycomb sandwiching, and adding supports such as bulk heads and longerons. I can make the fuselage in two pieces, and join them with rivets, and a adhesive to seal them solid.
With all due respect, you are not ready to begin designing an airplane.
Hang around some with EAA members / builders, learn the lingo, learn what standard practices are, learn about airplanes in general, learn to fly, learn basic aerodynamics and structures and systems, then begin your study of how to design an airplane.