Essentially the group would be your client and you would assess their needs and address them in the design. Beta test by users could demonstrate functionality and usability. Presentation could be on the website, or on the process of creating it. These may sound tough, but anybody can do any of them. Assesssment by users or development team.
Some projects lend themselves to a an academic paper more than others.
If you want a backup for formal writing skills, you might want to consider this option, preferably with partners. I have smaples of group research papers and videotape of presentations, mostly on critiques of boradcast journalism if you want to see them.