I found this free 3D drawing program lately and fiddled around with trying to create dungeond and such. It works great, if you go to http://sketchup.google.com/ you can download it and check the simple mockup of Blackwall keep I made in about 10 minutes at: http://sketchup.google.com/3dwarehouse/search?q=blackwall&ctyp=&btn G=Search+3D+Warehouse. I might try to make 3d versions of the spire or other 3D structures of the AoW later.