Hi Paul,
From what I've seen and read up on, the interior of the cockpit would be a wood color, ie.
Tamiya XF-59. If Eduard doesn't give you the details, go to scalemates and punch in 32047. It's the WnW's Albatross D.V (very similar) to yours. Scroll down and bring up the instructions. Use them for the coloring of the interior and all the little tidbits inside. You can cross reference the listed colors (mostly
Tamiya and Humbrol) and use what you have O/H. The cockpits were made of wood and there wouldn't be any bleed through from the outside...