Color Question?

All the ground equipment should be dark grey. Rubble at an aerodrome should be minimal. You want to keep this pretty clean so as not to throw a lot of stuff around with propwash. At this time in Europe, the Germans had air superiority, if not supremacy, so the 20mm would have been for emergency only. The Brits were busy defending themselves and weren't attacking all that much. Basically, for this scene, keep it clean.

Ajafleche thanks for your good opinion(like allways).
I will try to do something simple and good.

Pedro