K, so, LOVE the idea, just a couple of recommendations. First, it sounds like this is one person's idea. I'd highly recommend starting locally with your own community before posting online for development. This will allow the online call for help to come from a community. Second, by starting locally, the author will gain experience working in a collaborative and consensus driven manner. Not an easy skill to gain but one which will be invaluable for such a project. Third, there are already groups working on this. Maybe join their project, branch off of it, or reference them and comment why the author believes a new project will better serve a community. And lastly, there is no single-stack that will provide the single solution. The nature of communities requires dynamic, evolving, flexible, multiple approach solution sets. Best of luck!