As Gantu says, Andy...there are so many different versions and varieties of the Type V11c, they even differed from boat to boat in the same yard.
Two main things for you...first, choose an actual boat to base your model on, then you'll have some idea of what will be going where. And then get hold of a copy of the book "Anatomy of a ship...the Type V11 U-boat", there are normally a few on Amazon. Those series of books are a proverbial bible for modellers, they are full of photos, drawings and information.
Then go hunting the 'net for photos...there's stacks of pics of various Type V11's.
Somewhere on my desktop pc I have a stack of Type V11c stuff, I'll go hunting later and send you a zip file.