Many thanks for the references!
I finally have something to show you. I started with the Le Rhohes, apart from slightly thick fins of the cylinders they are very good.
I especially like the sparkplugs. I`ve added the pushrods and the wiring. The pictures don`t show the way I weathered them, it was hard for me to take a good picture showing the weathering using the artificial lighting.
Here are the engines after the first coat of primer:
Finished engines: