This is too late for this build but might help in the future for the wing stripes. Before you paint the camo colors, lay down the white paint. Place five equal widths of tape side by side on the top and bottom of the wings, as Andy said, in 1/48 scale, 3/8" wide. (You'll have to deal with the compound curves of the fuselage differently.) Paint your top and bottom colors. When it's dry enough to handle, remove the second and fourth pieces of tape and paint the black stripes. The model is coming along great Chris.
Geo