project based pier

Hi, I'm investigating using Pier to develop a site where registered users can have one or more associated projects. These projects should be bookmarkable. A good analogy would be the projects in squeaksource. Using that analogy how would one go about developing something like squeaksource in pier? Would the page structure expand as users registered new projects? For example: root |--- home |--- users |--- projects | |--- Announcements |--- Gofer |--- Helvetica . . |--- Pier | --- Wiki | --- Blog | --- News | --- Versions | --- Latest where each of the projects includes it's own sub-pages; wiki/blog/news/versions/latest etc. As the number of projects grew, would using Pier like this cause any memory/performance issues? Any other thoughts for how to structure a site of this type. Thanks Nick