You can't underestimate how much the design of this system flies directly in the face of the conventional wisdom in the US of how IT in a school is supposed to work. With mesh networking, there won't be a hard firewall between the school and the community, or the rest of the web. Chat isn't diabled; it is explicitly enabled. The underlying software is not locked down; it is unlocked by design. If you've been writing this project off as a simple attempt to distribute cheap hardware, prepare to have your eyes opened.