Thanks for the new ct drawings. I suppose the pipes under the upper platform are containers for spare barrels for the 3,7 cm AA gun.
Yes, the pipes are the spare barrels for the 3.7 cm Flak guns.
If you are going to add the spare barrels be aware that there are two styles.
Style 1. War late - Usual position.
Style 2. U-boats constructed by
Flensburger Schiffbau-Gesellschaft, Flensburg, they lower the angle of the spare barrels to about 3 degs, nearly flat. Like my drawing. Reason unknown?
Just a question: Do you have frame drawings for the ct? Maybe from some original source?
I have never seen any frame diagrams, drawings or original German measurements of the turms. I have seen a very few of the conning tower original measurements, but they are a little conflicting with other measurements of seen. I need to do some more research in this area and see which ones are correct.
There are a few line drawing of late war Type VIIC’s and Type VIIC/41’s but I would not expect them to be accurate, they are okay only for a guide.