Aloy schoonerbumm,
I don't think you can access info for the tower , on the site yet.
I've tried.
As far as the quality of the Nautilus products, I've been told
they are excellent. Haven't tried myself, I scratchbuild all my
conversions.
To find configurations of particular u-boat is quite a challenge.
Even uboat.net will give you the general boat type A, B, C ,C/41 etc.
but I've never came across any info for a specfic tower on a specfic boat.
Your best bet is to research photos and apply.
Here are some excellent sources:
Warship pictorial No:27 Kreigsmarine Type VII U-boats
German U-boat Type VII Heinz J. Nowarra
U-boats in action Squadron Signal No:1
U-boat War Squadron Signal
Med boats did have a particular camo.
Light Gray on upper vertical hull above waterline with irregular splotches.
Primer was dark gray on wartime boats (according to my sources)
See photos in the books and also you can see some very
interesting tower paint jobs at:
www.dream-arts.de
Hope the info is of some help,
Have a nice day and happy modeling !
Joe