I highly recommend Friedrich Forstmeier's book, Deutsche Grosskamschiffe 1915-1918

Anyone who is interested in German warships during the period 1905-1918 needs to read Deutsche Grosskamschiffe 1915-1918. What I was interested in is the information about planned ships that were never built, and the evolution of ideas, during the war. The last drawings in the book look a lot like the panzerschiffe Deutschland/Lützow, built postwar. There may be something better, than this book, but this is the work that I know on this subject.