There are several organizations like Chattanooga.Digital out there although with different focuses and scopes of services. One I just connected with is MayFirst, which provides shared apps and web hosting services to individuals and organizations for social justice. 

Basic membership is $50/year for 10 GB storage. Advanced membership allows for multiple emails, sites, etc., and is priced on a sliding scale based on income, storage, and optional VPS capacity that starts at $63/year for 40 GB. Services include chat (Jabber/XMPP), cloud file sharing (Nextcloud), Discourse server(s), email accounts and lists (Mailman), and video conferencing (Jitsi). They use CiviCRM for membership.

I think we should basically copy them, although I think our stack will be a bit different and I'm not real keen on their pricing model. Who would be interested in talking with them about their operations and stack? I'm interested in how the manage their Nextcloud and email services and their position on digital identities as well as their administrative systems and organizational structure.