Idea is great. I just want to say something about the names.
I'm from Croatia, so I must warn u
First of all: it's not Zagrab but Zagreb and it's misplaced. Real Zagreb is exactly on your border between Zagreb an Belovar. U can redraw the border more to the south and then u'll have Zagreb on the north and Karlovac on the south. Also, Belovar is Bjelovar if u want to keep this name of the territorry.
2. Poszega is ok but it will be more correct to call it Slavonia or Slavonien in German
3. Lika-Kravaba does not mean anything. Kravaba does not exist. U can call it only Lika. Krbava (u wrote Kravaba) is river in Lika
4. Dalmatien- it's ok if u want to have german names, but also u can call it Dalmatia
great job by now, hope that it will be soon playing on it. best regards