[Zope] Using relational DB for ZODB storage

[Ivan]

Greetings,

I am looking for ways to use a relational database (Solid, and
possibly Informix) as a storage for ZODB objects. According to the
ZODB How-To, development on a relational DB storage manager is taking
place. However, I don't know what is the current state of this
project, how I can obtain the source code, and how I can contact the
developers. 

Perhaps someone can provide me with this information?

Regards,
Ivan Raikov