This is my first post here. I stumbled across this topic from a google search. Great effort and a good cause I’ve had a few good experiences in hackspaces (though haven’t been to many in the past few years) I would be happy to donate a day or so’s time to helping you work out if civicrm is right for you, and helping you get started. I can’t promise to commit much more than that, but it’d be a good start, and I’d always be available to answer questions (plus there are lots of other ways to get help, such as civicrm.stackexchange.com). If that would be useful, let me know. I’ve worked with CiviCRM since 2008 and am pretty experienced with it, and know the community well. I’m based 20 minutes north of Exeter at the minute, in case that is near anyone.
Since it was mentioned above, as well as being used by the FSF, it’s also used by EFF, the Wikipedia Foundation, and a few other techy-non profits (as well as many that are not technical ones).
Drop me an email at email@example.com if you’d like to chat some more.