I found this great site that is excellent reference for u-boat Type VII conning tower variants. Some of you may already have been here, but those who have not,
here it is.
http://dream-arts.de
These towers are designed for the Robbe U-47 and are in 1:40 scale. They are made of resin and are extremely detailed. I am using them for visual reference.
They have to be the best reference I have come across to date.
The site is in German, but it is very easy to navigate. ENJOY !
Have a nice day and happy modelling,
 
 Joe































