Here are a few more images of the latest progress:
Sometimes I feel like a lazy person trapped in a busy hobby. I needed to make the Mercedes D.II engine but cheated slightly to save some time. I turned a cylinder out of styrene rod, then cast two identical copies and stuck them together. The D.II has three sets of paired cylinders and I found that if I made one pair with the rocker blocks, valve springs, and its share of the timing rod all as one piece, I could then make a small silicone mould of it and cast a few resin copies.
Each pair of cylinders were cast with a little hole at the back to accept the timing rod of the set of cylinders behind it. In this way, I could daisy-chain them all together and mount them on a bit of plastic strip for ease of handling. Pretty happy with that. Job done!
While I was feeling frisky and with the time I saved, I also made some facias for the floor and bulkheads. As well as a couple of seats with cushions. Feeling pleased with the progress. Now I can start worrying about how to do those wings...