Yes, never-where AUs for the win!
I have no usable drawing of the DPs. For the mainstream-destroyer the 12,8 dp is most useful, I agree here. But it's germanish to do a special version of a something with more engine or firepower. So the 1945 B is fitted with 15cm. A logical invention would be a 15cm DP-turret.
I'm now on the 1944 projected destroyer, the 1938 and 1940 Spahkreuzers are half ready. And some other of the small stuff. Got to dig my own sources. For example, Scharrenberg gave a big bunch of technical drawings from radar prototypes. They are from the Bundesarchiv and a very valuable and, most important, true source.
There are also existing photos of a streaming model of an aa-cruiser-prototype. The model is still stored there. These are photos you cannot google! But, I've got to dig 'em out.
Minor color mistakes will be finished soon.
edit: just finished, hope I met all.