If a part is drawn as a double-faced polygon in Metasequoia, it will have the same texture both inside and out as it is very difficult and time-consuming to separate the two faces in order to apply different textures. My solution is to use multiple nested skins. These can be single or double faced and each skin can easily painted with a different texture. In fact, I prefer double faced polygons. I find that it makes debugging much easier.

Here with this Lanc, there is a third level, the internal structure of the cockpit. I started drawing the instruments individually in the main panel; but it was a great deal of work which had to be repeated every time there was an adjustment. Luckily, I found a splendid photograph of the whole main instrument panel at http://www.SpitfireSpares.com. Graham very kindly gave me permission to use the photo. They have a wealth of spares and other material for many WWII British and American aircraft with tons of photos. To use an integrated photo was a wise decision even if I have lost to some extent a 3D feel.

Anyway, here are some pics; first a square view of the panel. an oblique view of the internal structure, then the first nested skin and finally the whole covered by the final outer skin.

I am drawing the pilot's seat at the moment. I try to understand and give some indication of the complexity with my drawing. At the moment I am trying to understand the seat raising mechanism and the hydraulic control valves and pipework for the flaps and undercarriage. It's not easy. The photographic coverage is not complete. I feel like Sherlock Holmes at times, deducing what must be there.

Best wishes to all
Mike