Tom: glad you found the link useful too.
Kurt: I'm happy I got the poi reference right!! Also, you could check out the thread "That Aussie's in Iraq" somewhere here in the Diorama section. The buildings for that were 3-4 story Iraq buildings, but the author gave a good step-by-step on how he made the walls out of plaster. Other threads will also help.
Post your progress as you go, we'd love to see and there are a lot of people on this site that can help.
Happy Modelling, -zon