Hi Filippo,
Yeah, the aft edge looks really weird. From your photos it looks like there is a deep groove all along the trailing edge. Is there a big groove or am I seeing things? There should not be anything like this at the aft end of the rudder; the only thing on the real boats was a vertical weld seam.
The other issue is that there is only one horizontal weld seam. It is really hard to see the seams on real boats but the few I've seen have three horizontal weld seams (as well as two vertical seams). All three can easily be seen on the inside of the starboard rudder on the top photo I posted in my previous email from last night.
Here is another shot, although it is a very early VIIB -
I've pointed the blue arrows to show the three horizontal weld seams.
Trumpeter could have been influenced by the outside of the port rudder on U 995, which looks like it has only one horizontal weld seam. I think it is because the two others have worn away over the years. I think all three horizontal seams can be seen on the inside of both rudders in some photos of U 995 (presumably these have not worn or been sandblasted away).
If anyone has any period shots showing any weld seams please post.
Cheers,
Dougie