Thank you all for those encouraging comments!
Attention now turns to the flying surfaces starting with the tail planes. After priming with white Stynylrez primer, pencils were used to draw the internal ribs (drafting pencil with 4B lead for the underside, a Raw Umber art pencil for the upper sides) after which MRP Bleached Linen paint was airbrushed in multiple light coats. The goal is to simulate the effect of translucent linen with light shining through from above, hence the darker lines on the bottom, but I also wanted to show a hint of the ribs on the top side. On the other hand, the scumble finish will also be applied to the tail and wing top surfaces so those ribs may not be visible when all is said and done.
Eric