>>5
I would make one, but who will use p2p network for one site? It could be something much more.
Layers:
1.Darknet encryption using latest crypteria(its unbreakable, since it random)
2.Random routing via nearest nodes(using something like netsukuku fractal routing)
3.Packet obfuscation(make it appear like standard TCP traffic)
4.App layer - Software signed by public keys(so author can distibute a BBS patch or update)
5.User level - Access either anonymously or use sha256 tripcode