You can't rip them yet.
NCA body key #2 is required, and the only way to retrieve it is via a TrustZone exploit.
So, until the 3.0.1+ trustzone exploit goes public, there is no method of extraction.
The key may get leaked by an, ahem... blue-coloured large container, but I wouldn't count on it.
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The people who added the models to the models-resource are part of the ReSwitched team, namely
@SciresM with the help of RandomTalkingBush. (Or vice-versa)