I took a stab at codifying a lot of what we've talked about in terms of "what code goes where" that's tribal knowledge thus far undocumented on our project; I've had another long-timer review it and I think it's ready for broader community input. Roughly 1 page, quick reading, should all be stuff we mostly know and agree upon.
Link: https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=199530302 Thanks. ~Josh