request/idea 

You are going to remove  soon. I think I have a possible solution. User Panonian has in the past created many great maps. Could you ask him to help out? Here,  that is his talk page where I asked. If you ask too, we could achieve much in terms of ending the problematic discussion with Ceha on that page. Here are some past maps that he has created, which demonstrate that he can do this.
 http://commons.wikimedia.org/wiki/File:Vojvodina_politics_map.png
 http://commons.wikimedia.org/wiki/File:Danube_banovina.png
 http://en.wikipedia.org/wiki/File:Vrbaska_banovina.png
 http://en.wikipedia.org/wiki/File:Vardar003.png
 http://en.wikipedia.org/wiki/File:Sandzak_region_map.png
As you see, he has created maps for some other Yugoslavia Banovinas in the past. I am sure that he would be willing to make another one for the Croat Banovina, but it would help if you ask him. (  ).