Martin and I are on the same wavelength here.
I attach (hopefully) six pictures of the set up I used in my Schnellboat.
I used the rudders from the kit and made the tubes and posts on the lathe.
I find that the turning circle is adequate for my needs,but I have made an attachable rudder that I put over the centre main rudder.To be honest I don’t use it as it really doesn’t make any great difference.
If you check out my boat harbour there are more pictures on that.
Also,I have built her so that the front and rear guns rotate.
If this is something you were thinking of then I am happy to share pictures of the set up.
Just let me know.
PS.Be good if you could do a blog on this.I for one would be interested 👍