Here’s an interesting piece from the Aang Ain’t White Journal on how the Avatar film set is further exposing the production as a racist whitewash. Here is a sample of the images they put up on their site:
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Bento at Japanistic
Avatar Film Set Exposes Ongoing Whitewashing
Regarding the first picture I believe that it is accurate because Sokka and Katara are of Inuit descent and people from that backround did live in housing such as this:
http://www.windows.ucar.edu/earth/polar/images/lc_inuithut_sm.jpg
BUT the actors that where chosen to play these character are definetly not!