First - I like the way this is coming along. I love the cockpit, and it's shaping up to be a great build.
On the theater stripes, I think the overwhelming wisdom will be to paint them first, then do the main colors. On my P-51B, I chose to paint them last for a couple of reasons:
1. My paint technique for the main color involves four coats, and if I were to have something masked, it would be a 5th to prevent bleeding. All that paint can build up on the stripes' edges, I believe (though maybe I'm wrong, because they do still hold washes in rivet detail).
2. I don't trust myself to not knock the masks around during the rest of the painting phase. Masking the rest of the plane instead of the stripes uses more materials, but I cut up plastic bag parts to save on tape.
I recommend spraying a light coat of gray over the olive drab first to make the coverage more uniform between top and bottom if you do decide to do it last.
Here is my P-51B I mentioned:
I look forward to seeing the rest of the build!
-BD-