The drawings are nice, but I agree with Matt. The CB does seem a little too British to be German with that layout. The DD is a very nice, sharp looking vessel. And your E-boat looks sharp too! The only thing is that the depth charge rack on the E-boat would serve better if it wasn't so angled like t...
I doubt that you need that many defensive machine guns. Also, the addition of so many vehicles on a small hull like this would destroy the center of balance. And that support gun would pretty much be useless with cargo on the deck.