I don't really understand why I would want to use this. Why wouldn't I just use SQLite3, if that's what's powering the SQL searches? (maybe with a pretty layer on top for external access.)

The KV/document stores that have been coming out are trying to address shortcomings, perceived or real, with RDBMSs. I think some explanation of the trade-offs which each part of the "mullet" make and how they would be obviated by this system would be helpful. Right now there are a ton of KV/Document stores as well as SQL databases, and I don't know how this is going to be different or why I should pay attention to this project.