RE: Guillow's Spitfire Build
I epoxied a couple of aluminum pins into the leading edge (there's a piece of hardwood glued to the back of the leading edge for extra strength). I epoxied a couple of hardwood blocks, with holes to fit over the aluminum pins, to the front of the former just in front of the wing. I secure the trailing edge of the wing to a drilled and tapped hardwood block glued to a former at the rear.