Justin,
I was looking at the LayerGroup REST API Documentation and I see that it has a POST API Document:
http://docs.geoserver.org/1.7.4/user/extensions/rest/rest-config-api.html#id8
However, it does not list what are the required parameters for a POST for a LayerGroup.
I assume I have to pass the name and the list of Layers. Do I need to specify a bounding box? What is that the bounding box of? How can I compile that bounding box?
What are the Styles? Do I have to specify those as well?
Ronak