Thanks for that Jim. I have certainly got my head around this layering process now. I am now trying different substances and techniques to see what looks best at which scale. Unfortunately you cant see on the photos but close up, under the optivisor, the layering is quite detailed.
I take it that's the big fat white envelope on top of the big brown envelope Paul?
I was surprised that the 172 took the same 1 35 techniques Si. However I couldn't go mad. Less is definitely more at this scale.