Thanks for your comments.
I found the bow thruster
here. It is the only scale looking I found on the internet. The price is extremely high but I told myself that I will pay this only once...
However up to now I have not find the correct setup. This has an internal gear. At the beginning I tried one geared motor MFA with 6:1 gear and then a direct graupner 500. The result was similar. No effect from the bow thruster.
Now I will try an MFA with 2.5:1 gear which is very powerful. I have the same motors for main propulsion. Let's see..
Rudders are the Robbe's 50x36mm cut in such a way in order to look like the original
For this vessel I have a profile plan and then all decks from double bottom up to bridge. So after drawing the frames I had an easy job. I draw the frames by hand, then I fix them a little bit with the very accurate design program paint
. Here is the file with the frames. If you print it in A4 then you have the frames in 1:100