The Strike Models mold for the Bismarck, from Swampworks, does have inaccuracies in the stern relating to the prop shafts. Here's what Stephen wrote a few months back on the Big Gun Forum:
I believe it was Swampy's first fiberglass mold, and he took some liberties to make the ship easier to work with and lay up (noticably in the back end). In Fast Gun, a single large prop shaft (3/16" or 1/4") is run through the the problem section and a much larger prop is added. There is also a whole section of the curve going to the prop is just missing. I would have liked that the mold been a better shape, but it is not something that I can change or economically replace.
Stephen is in transit to this weekend's battle in LA right now. If you're there, you can ask him in person. Otherwise, I'll have him email me a clarification that I'll post to the list.
Keri Morgret
Strike Models