Please be careful amidst all this to remember that this "integration" could be the undoing of the Kamailio/SR project, and may drive people to OpenSIPS. In the end, it is the users that matter.
The sip-router.org documentation is already excessively complicated and difficult to understand for anyone who does not routinely work with both the K and S code. At this point, the documentation, while voluminous, is overwhelming and, in places, woefully incomplete, while in other places, I would say "exhaustively" (perhaps "exhaustingly") complete.
All of this confusion - starting with the fundamental difference between K and SR, which nobody *I* know in the user community yet understands in any level of substance or detail - is starting to make OpenSIPS look very straightforward and self-evident. You don't want this.
I also encounter the widespread perception from my customers that a lot of time has been spent on "fun" and "interesting" integration work, not on developing features or fixing bugs. I hope they're wrong.