X3n0n, the Rhine-area is much larger than only Ruhrstadt; for your information, this is how I've devided Germany:
"Hannover": the Prussian provinces Hannover and Schleswig-Holstein, increased by Oldenburg, Mecklenburg-Schwerin, Bremen, Hamburg, and Luebeck.
"Rhineland": the Prussian provinces Rheinprovinz (includes "Ruhrstadt"), Westfalen, and Hessen-Nassau, increased by Waldeck, Hesse-Darmstadt, the Bavarian Rheinpfaltz, Baden, and Alsace-Lorrraine (Baden and A-L are new additions compared to the classic map)
"Munich": the kingdoms of Bavaria and Württemberg (now excluding Baden, Saxony, and Thuringia)
"Saxony": the Prussian provinces Brandenburg (Berlin) and Saxony (roughly Sachsen-Anhalt), the kingdom of Saxony (Dresden, Leipzig), and those tiny Thuringian states
"Silesia": the Prussian provinces Posen and Silesia
"Prussia": the Prussian provinces Pommern, West-Prussia, and East-Prussia
I still believe the ""Rhineland" area is far more populous and more important than the "Saxony-Berlin" area. A possibility would be to make Saxony-Berlin a supply centre instead of Munich.
Hannover or Hamburg seem more appropiate names than Kiel; the former because the Hannover province only forms roughly half of this Diplomacy area, the latter because it was arguable the most important city in Northern Germany, the most important German port, and because it was connected to both the North Sea (via the Elbe) and the Baltic Sea (via the Luebeck Canal, which was used as an alternative to the Kiel Canal; both canals were too small around 1900 to meet the demands of the German/Prussian navy). I don't think it's really important the headquarters and some offices were located in Kiel.
Dixi.