my biggest complaint about the model would be the railings on the hull and conning tower...too large for the scale. Additionally, I'm pretty sure the stanchions for the deck railings should come out of the edge of the horizontal surface of the deck, not the upper side of the hull casing.
The Wintergarten railings on the CT could be done with finer wire (or sprue, if you have the talent!)
one of the Type IX links:
http://www.modelwarships.com/gallery/ss/dkm/type-9c-200-gb/uboat-index.html
Quidquid latine dictum sit, altum sonatur :)