Great to see the new pictures, especially the Spit cockpit. I hope you can make the graphics so that nearby planes look brighter and sharper than the terrain far below. Some examples here:
http://www.taysideaviation.co.uk/wms...ght_90x125.jpg
http://upload.wikimedia.org/wikipedi..._in_Flight.jpg
This less bright ground rendering gives you good effect of altitude and makes it easier to spot planes.