The only thing the wingspan is used for is to determine scale. To answer your question about wing vertical movement. You can move the wing up or down 10% the max. height of the fuse., usually measured at the highest point of the windshield. So in this example: If the fuse is 10" tall at it's max height, you can move the wing up or down 1". That is how I understand this rule, and seen it used at the unlimited level.