I recently saw something like what you're talking about on the web site for the Kansas City Bike Club (but was unable to find it just now) that referred to a project of yours that is similar in nature. It was a project that donated bicycles to folks who couldn't afford them and worked on bikes as a part of the process. I think part of it was that they would show you how to fix your own bike, or help you fix it as part of the project. You might contact the club and get more info on that project. I think it's very close to what you're looking for and i'm thinking of participating so I can learn how to work on my own bike.