I found this page from UK MOD Defence Acquisition website (N.American spelling is Defense), which actually does shed light on Readiness Level from a new perspective. I have never thought of combining the V-model of systems engineering to the nine levels of technology maturity.
I would like to reiterate that although this article explains System Readiness Level, it comes to show that this concept has not been coined as one unique tool yet. However, it is interesting to look and browse around to see what our friends in UK think about these System Engineering stuff.
http://aof.mod.uk/aofcontent/tactical/techman/content/srl_whatarethey.htm