I have a good friend who just completed his 1st composite version of his personal design. Everything is his own design and I mean everything. The labor of love took over 2 years and it is a thing of beauty. Its the smoothest plane I have ever personally seen fly.
He had over 500 hours in hand carving the plug alone.
He went through 3 stages.
1 was a boxy design to flight test the tail moment, wing design and all the basic flight characteristics.
2 was a balsa version of the model
3. is the finished version, a composite fuselage, with foam core wings that are glassed and all of it is custom painted. The wings are so light you wouldnt believe it. If you seriously do it and do it right you will be sick of it by the time you actually make your 1st flight. But it was a joy to see the look of satisfaction on his face as the plane lifted off and flew out.

I know his wing is symmetrical and there is a tough of dihedral in it. All of the wing incidence and tail moment rationale that went into the design he has talked to me about goes WAY over my head.. GOOD LUCK!