Hello,
I am an expert in elearning systems and development with over 14 years of experience in the field. I'd be happy to work for you on this project.
I have the necessary experience to work on this learndash project. We need to have a detailed discussion about this in PM as writing here is very limited.
As you know there are many additional plugins for learndash, I'd do what you are requesting in the description plus the demo course, but need more details of what you want to do in this course, plus adding some users to make sense or enrolling them into the course.
I'd also configure and customize learndash to fulfill your needs as mentioned or even the non-mentioned configurations.
For the security, the .htaccess is not bad, but since you are using wordpress, there are much better ways to mange security.
Awaiting your reply,
Best regards,