i relized some interestng model but not perfect ,i builded the model that you can see below on my youtube channel and into my google+ you can find some images of them
https://www.youtube.com/watch?feature=player_detailpage&list=FLqIEJ1MeGiuKdIaCv-HPSJQ&v=8RNndmHjPs0
https://www.youtube.com/watch?feature=player_detailpage&list=FLqIEJ1MeGiuKdIaCv-HPSJQ&v=6WvHOIKCos4
https://www.youtube.com/watch?feature=player_detailpage&list=FLqIEJ1MeGiuKdIaCv-HPSJQ&v=9j9oMpuA-cU
[YOUTUBE]6WvHOIKCos4[/YOUTUBE]
https://www.youtube.com/watch?feature=player_detailpage&list=FLqIEJ1MeGiuKdIaCv-HPSJQ&v=8RNndmHjPs0
https://www.youtube.com/watch?feature=player_detailpage&list=FLqIEJ1MeGiuKdIaCv-HPSJQ&v=6WvHOIKCos4
https://www.youtube.com/watch?feature=player_detailpage&list=FLqIEJ1MeGiuKdIaCv-HPSJQ&v=9j9oMpuA-cU
[YOUTUBE]6WvHOIKCos4[/YOUTUBE]