Yakima Skybox rooftop hard shell cargo carrier

[noworyz]

Hi All,
Does anyone have any pictures with a 16/18/21 cu ft cargo box on their E53? I am particulary interested in the over-hang and access to the rear hatch. None of the pictures i have seen so far are clear enough for me to make a decision on which size I should get.
I am considering the Yakima
skybox 16 - http://www.rei.com/product/738788
or
skybox 18 - http://www.rei.com/product/738787
Thule have similiar boxes with similiar dimensions Ascent/Atlantis 1600 or Ascent/Atlantis 1800 for the 16/18 cu ft respectively.
Thanks for you help.