I have been doing quite a lot on this build although I haven't posted any updates. I have a box full of various painted sub-assemblies which I can't be bothered to photograph, I've now moved on to the main parts. After a long time taken to eliminate the seam on the fuselage join, I have undercoated the main parts and am doing some pre-weathering before applying the Aviattic decals.
I don't like to over-weather my WWI aircraft but the Eindecker is an exception. They were notorious for getting soaked in castor oil, so I've been experimenting with pre-weathering to get the look of the oil soaking through the fabric. I've tried various concoctions for this, and my favourite is Tamiya brown panel liner. Here's the undercoated fuselage with the first coat of weathering applied:

The panel liner dries with a nice stained effect, especially around the edges. However, one coat is too transparent, so I applied another coat to really darken the staining. I also applied this to the wings, all based on photos of the original machine:

It's now nice and dark so the next step is to gloss everything and apply the decals. Watch this space......