Hi Case,
Please do not distribute the SDK or parts of the SDK with your code.
Instead, direct people to
www.ac3d.org and let them know what version of AC3D your plugin works with.
If you feel that your plugin would be widely useful to others, you can send it to me and it will be included with the main plugin pack (for all supported platforms). (Ensure you use the about/info functions to give yourself credit).
Also ensure you announce your plugin on this forum (in tutorials and other resources).
What is your plugin for?
Andy