flakmonkey,
have you used this site:
http://www.u-historia.com/
I place it into Google translate and it works great. I am working on a 1 72 scale interior model ans this site has been useful.
Let me dig through some of my .pdf files and see if I have anything.
This looks promising, although I dont have it yet so can say whether it covers the conning tower:
http://www.uboataces.com/u995.shtml
Brett