What about this building from Bihać (ignore minaret)? Not sure about accuracy of it but it looks fairly simple
Spoiler Alert, click show to read:
Here is link to forum where it was posted http://www.allempires.com/forum/foru...s.asp?TID=5625
And this is from author of article: The oldest mosque in the Bosnian city of Bihac is a unique example of this process. It was converted into a mosque when the people of what was then a town converted to Islam. What makes the Bihac mosque so unique is, firstly, the original church was a Bosnian Church. Secondly, the church was converted into a mosque within a single lifetime of being built so many of the same people who helped build it certainly helped convert it