The decals are sized to fit Warlord Cruel Seas and other 3D printed Schnellboots. We have strived to make them as historically accurate as possible.  Unfortunatly much of the history of the KMSB has been lost. Some of the reference used were:
Schnelleboots - A Complete Opperational History by Lawrence Paterson - Highly recommended read!
Schnellboot In Action by David Krakow
German S-Boats by Steve Wiper
German S-Boote at War: 1939-1945 by Jean-Philippe Dallies-Labourdette 
And a most helpful pictorial history website: Die Schnellboot-Seite
URL: http://www.s-boot.net/englisch/sboats-kriegsmarine-coatofarms.html