This is my basic organizational sense of this project. The overall organization is “books” in the left column. Books are broken down by topics and then posts can be made in topics.

Unregistered users can see the public topics and posts. But they can’t make any posts of their own.

For a registered user, their view of the web site is the same as for the unregistered user except they can make posts. Additionally, they can edit their profile and change their password and email address.

For enhanced users, the site expands to restricted books.

Two additional thoughts. When a new post is added, a copy of it will be emailed to users.

Right now, there is a rather long delay after the post is submitted before it is process and the program moves on. That is mainly the result of Gmail processing requirements. I'm not sure if I can do anything to minimize that delay, but right now it is there.