1.For a very excellent technical approach to
Nizwa Fort , its floor plan and shooting positions etc please see
http://www.behance.net/gallery/15940...-Fort-of-Nizwa
2. See the books on Portuguese Forts in Oman...
http://www.colonialvoyage.com/category/asia/oman/#
3. For a sympathetic outline of Omans Forts please read
http://www.saudiaramcoworld.com/issu...ified.oman.htm note it is slightly out of date in that Bahla has by now been more or less restored.
4. A small pocket book style guide and a short video on Omani Forts exists at
http://omanpocketguide.com/index.php...=97&Itemid=132
5. Take a look at these old pictures of Oman...Note the destruction caused by neglect in the pictured forts...In some cases the later reconstruction had to be virtually from scratch.
http://qal3ataltareekh.blogspot.co.u...-post.html?m=1