Ask HN: How best to prepare a project for crowdsourcing?

I have been working for some time on a new approach to text markup, combining graph database entities and overlapping annotations, that I think could lead to some really interesting insights with text. For example, enabling huge networks of relationships between people, events, concepts, etc., to be mapped from historical documents.

I am working on this project solo, having invented a new kind of annotation editor, the graph model, and entered hundreds of historical letters and diary entries from the Renaissance. But I am looking now to take the next step of opening it up to users who either want to work on these texts, or even add their own.

The project has stimulated a bit of interest before when I've publicised it, but I don't have any experience building a community around it.

Are there any other HN developers who have successfully been able to build a crowdsourcing community around this kind of humanities project? I would welcome your insights to maximise the chances of my success in unveiling this to the internet.