Hello Lars
I have seen a photo (somewhere) of a Nieu 11 with plywood covered cockpit. So I go for that
The inside is painted with Gunze Sangyo H85 Sail Color but any tan color will do
Forward parts was painted with Burnt Sienna Oil color
Then removed with a clean cloth
Then a Wood Effect decal from Spada Decals
(http://www.spada-decals.com/cariboost1/crbst_2.html)
And a photo with the inside frame
The frame is painted with Tamiya TS 46 Light Sand, then with Burnt Sienna Oil color, then removed with a dry pensel and finally a cote of Tamiya X-26 Clear Orange. But it seems that my fingers have removed some of the color during handling
Olve