Upon successful completion of this website (after about a year of work) it saw a brief flurry of activity, mainly used as a file repository for various high school groups. After that, it fell into disuse and eventually was not worth paying for the website domain name. I am still happy with the work done on making this website functional and a useful product, and now would like to publish the entire website's source for anyone who might find it helpful. It requires MySQL databases set up as described in the includes.php file.
Activshare.net full source code.