Hi folks,
Just wanted to come back with an update on this topic. In order for the Civil 3D Toolkit (not open source) to be combined with Camber (open source), the Toolkit source code would first need to be made publicly available. I have been working on this, but for a variety of reasons this is not going to happen. This means that the two packages are going to remain separate. I am sorry for the news!
Since I am an Autodesk employee, my efforts are focused on improving the out-of-the-box experience in Dynamo for Civil 3D. Camber was a side project for me when I was still working as a civil engineer, and it no longer makes sense for me to work on it. Please see my recent post in the Camber Feedback Thread for more information.
I cannot speak for the Civil 3D Toolkit as I am not the author/maintainer. My recommendation is to direct any comments/questions to the Civil 3D Toolkit Feedback thread.