Forget those plans I posted before, they are from the WK-202 Type XVII
Apparently there were several different versions grouped as Type XVII, but the best looking and most advanced one was the XVIIB, which included also a sonar dome on the bow.
You can find the plans and in depth article here:
http://www.u-historia.com/
Go to "Técnica---->U-Boote---->Tipo XVII" and scroll down until you see the plans for the Type XVIIB
What a beautiful looking boat