In the instruction booklet Eduard states that the colour of the inside of the exhaust should be bright green! I wouldn't have believed it if not for this book!
The colour mix for this bright green I arrived at from these colours....
Game Color 72032 Escorpena Green : 2
Model Air 71094 Green Zinc : 4
Model Color 70883 Silver Grey : 1
In the instruction booklet it shows that the area at the back of the nose cone is to be painted Dark Iron. The actual area, as shown clearly in the Wings & Wheels Publications book, is much larger than that shown in the instruction booklet and should cover an area much further forward, illustrated here in the pink.
Next up is the cockpit. Here you see the sidewalls under construction.