Well... that's the old Unimog created by Box5diesel I think... It should be able to be located in the Archives I believe.
[video=youtube;3SGVaMhIVuU]https://www.youtube.com/watch?v=3SGVaMhIVuU[/video]
Either that or its the even older one made by FatAlfie...
[video=youtube;4pLbUJNgle8]https://www.youtube.com/watch?v=4pLbUJNgle8[/video]
But I don't think his was ever released...