Nice shots Dave. The one showing the instrument panel has what I think is the flap control lever, near the bottom left of the main panel, which appears to have the setting numbers on it, as per Bf109 etc. The 'stripes' on the wings, given that they are flap-angle indicators, would be for a quick visual confirmation, especially as it looks like the view of the flap control would be difficult, given the 'tight' cockpit conditions. Similar types of visual-indicator marks, stripes, multiple bands and so on, were used on the Bf109, P51 etc, and on some modern light aircraft. Simple, but effective.