Here a little bit of information on how the Germans fixed the steel plate to the casting of the U-boat, if people are keen to know.
While redrawing the correct bow for my Type VIIC/41 late month, I noted that my u-boat was short by about 60 mm (or a couple of millimetres at 1:32). I found my error in my base datum measurements. The ribbing should measure 500 mm but somehow my were approximately
5/
1000 millimetres short
Over the 130 plus ribs is added up. I could have easy stretch the drawing to get the extra length I needed and no one would know (No one would have every noticed the drawing was 2 mm short anyway
). However, for me my drawing needs to be as near to 100% correct as I can get it, so I redrawn all 6000 plus rivets, all the ribbing and framing.
After nearly 40 hours of drawing, now all the ribbing frames etc... are correct to
1/
1000 For the last 3 days I had been redrawing the keel. I noticed I had the incorrect number of rivets between the internal framing so I fix this also. While doing this I also notice several rows of double rivets. It looks like the Germans would rivets each steel plate to the internal framing. This made me think, as I never seen rows of double rivets on the casting. So I recheck the casting. It looks like on the casting the German used a different style to fix the steel plate. They would overlay the steel plate steel plate and then wield the plates together.
In this pictures you can see the rows double rivets on the keel.
In this pictures you can see the single rows rivets on the keel (green) and the overlap of the steel plate and the weild (red).