RE: Lets try to paint a Q40
I like to lightly bolt the wing on to lay out stripes it helps to get a good balance of color on fuse and wing.
Here I use the wing fillet to start the angle on the stripeI also paint the fillet the same color as the wing stripe this helps tie the fuse and wing together.
I usually paint the two primary colors first and then lay out my numbers and smaller stripes to proportion all together.