If you’re serious about world building, this one might be something for you: The California State University is/was offering a course in World Building. The course is offered both on-campus and as a distance learning course. It focuses on realistic, scientific world-building. I am not sure if the course is still actively offered; the Open University does not seem to list it. I’m actually interested in this course, but unfortunately the professor who taught it does not reply to email at the moment. A pity.
Enderra
Fiction, World Building, and Art
I think I may have found what you are looking for. I'm not sure because I haven't trolled the website in-depth like I want but maybe it will be of some service to you.
http://www.world-builders.org/
Thank you – but, yeah, I know the site. It's just that the course itself isn't being offered anymore, and all my inquiries into the matter have remained basically unanswered.
I appreciate your help, though!