Hello,
The short answer is no, we do not have or maintain design diagrams, whether in UML or any other notation.
All we have is available from the web site, including the source code, which is relatively well commented, and the documentation. In particular, we have a "
working from the source code" section that will help you get started with a development environment.
If you have specific questions about the code, please do not hesitate to get back to us in these forums.
Sincerely,
-Laurent