Oh I figured it out by accident. I accidentally double-clicked the Modelling tab on the Ribbon and it extended everything properly. Happy accident it seems.
The neck is not correct. The spine attaches to the back of the skull, not behind the jaw like in humans. The neck curves backward, extending the silhouette of the 'head' like a bird.
One common issue I've seen in archviz work at major retailers (I used to work at Wayfair, now I provide software for similar big retailers) is how difficult it is to get consistent quality assets from outsourcers. There's a strong need for validation systems. We had an extensive system in Max that checked for more than 100…