Thank you all fro your fantastic feedback!
@Xan
I'm always surprised about the huge know-how of the forum members here - what a great amount of information in your post and the pictures are so great!
According to your dimensions the first one was really not wide enough.
The actual one could be bit more sanded to reach more the shape of your photos, but I glued it to the resin engine already.
Regarding my wood work, I have that in my build reports, see e.g. the Lebed one in the first post.
https://forum.ww1aircraftmodels.com/index.php?topic=8864.0 The problem is only to find good wood! In my experience wood from fruit trees is good, like peer, cherry and boxwood. I used also canadian maple and mountain maple. I'm still experimenting. That is a nature product, every peace is different, even from the same kind of wood.
After cut of veneer on a small circular saw I glue the veneer to a block, then raw milling (by hand) and mostly sanding.
Cheers,
Frank