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Two years ago I developed a software called PADGE which project the autocad drawings on Google earth directly without any other process
*the software is designed to be used under windows xp
*Google earth must be installed before installing the software
*after opening you drawing in autocad with the command gg at the command line the program will start
*in options you will find the UTM zone write 36 which the egypt zone you can change it to any other zone
* The drawing must be in WGS84 UTM coordinate system

Most of Engineering offices and others use this my first edition of this software in Jeddah
you will find an article on news paper about this software at
[url]http://www.alriyadh.com/2008/03/06/article323522.html