Beeg,
Check out the site I posted and every other link you find.
Even if you don't find a small topo, there is a small possibility that you will find photographs of the city that will help you to design the place.
I would also suggest that you search on Russian sites for maps, and Islamic and Turkish sites for photographs.
If you are lucky you will discover an aerial photo of the city.
cheers & good luck,
Pyros
p.s there aren't any mountains or hills in the area of Tal Afar