Thank you Rick, Stephen, Ken, Richie, Andreas, EBF and Manni! Highly appreciated and motivation to go further!

How much of this will be visible on the completed model?
I hope all what I have done while viewing through the fuselage opening. I have done done the seat frame as this one would not be visible.
Our WWI subjects shows more compared to e.g. jet models, because we have no cockpit glass on top of the details

The wood tones also (better than the real wood).
With naked eye the real wood looks ok, but I must admit that this "Indian apple" has a bit more grain. I used this only on the floor board, so it shows more a darker used wood.
Would it be possible to paint in the wood grain 'patterns' before applying the orange overcoat? Perhaps in this scale it would not look right?
Hmm, I do not understand your question? That is, what I have done. May be may description was confusing.
- Primed white with airbrush
- Wood base beige (acrylic wood paint set) with brush
- wood grain brown (acrylic wood paint set) with brush
Then I had this state (sorry, the colors looks a bit unreal):

A clear orange was painted as latest step with airbrush.

Looks like lots of work has gone into it, it must be very satisfying to create all these little details.
Oh yes Richie, and even more work to be done!
I expect to see this beauty finished on Saturday, Frank! 
Sorry Andreas, no way! There is too much work in front of me, and I need to think about solutions for problems I already know about

Also the paints will need some drying time before I can mask fro the next layer.
May be I should explain: at the coming weekend there is a
Model Fair and Exhibition in Ried im Innkreis (Austria), the first one I know after the Covid shutdown. I will be there with some of my later models, so if you have a chance please come and meet us there!
This looks so sick, Frank. Allways I see your progress I instantly want to go into my man cave and start modeling.
Yes Manni, I'm sick! The disease is called AMS - Advanced Modeling Syndrom.
The next update will be even more crazy!

But if it motivates you to continue with your projects all is ok.
Cheers,
Frank