Advice On A New-School Old-School BBS

An anonymous reader asks I am thinking about setting up a local "community" network over WiFi minus internet connection. In other words, I would like to run a small server isolated from the web as an experiment in small scale networks (e.g., serving a café-heavy one-block radius.) I have plenty of clever ideas -- discussion/gripe boards, weird artistic projects -- anything to bring back the old-school BBS memories where online users were drawn from a single geographic location. But everything I've learned so far is how to act as a small node on someone else's network. How can I make my own -- and make it wireless? Google doesn't pull much up that I can find: it is mostly targeted towards those building a (free or profit) Internet access point." (Read on for more.)

" Does anybody have sources of information for how to learn about setting up the network I have in mind? Basic tutorials and those covering more advanced issues such as security would be very helpful. Finally, is there anyone out there with real world experience? Beyond imparting technical help, do you have suggestions for implementation? What worked, and what didn't? Did the lack of internet access make the project unpopular? (And if you did provide internet access as a teaser, how did you handle liability and financial issues?)"

(This reminds me of the Community Memory Project; can anyone point to some modern equivalents?)