Bones
Exciting. I have a skeleton exported. The next phase is getting the animations out, playback, and then combining that with the skinning information which has yet to be exported.
To give you an idea of how many polygons are involved:
Originally, I had used a 1x1x4 cube split into 32x32x32 segments. That quickly turned out to be a bad idea. The final split is 16x16x16.