My suggestion for a sub-project is for the development team to consider posting the entity domain model (or a working version of it) on this site. For instance, it would be helpful to know what attributes and relationships you apply to a unit, or to a member, or missionary application, etc. This would get the community on the same page before you ever consider releasing code for open source development. Some hefty UML would be awfully interesting to look at.
Then again, what good is a domain model without an application to contribute to...
![Wink ;)](./images/smilies/icon_e_wink.gif)
sfm