I'm reading this with some interest. I still think about picking up a Rigby in a 550, realizing that it will be a bit of a project rifle. I think with Ruger offering the African in a 9.3x62, I've talked myself out of that one from CZ. If I do get a .416 Rigby, Mark you better be prepared for a flood of PMs!
(I'd also be interested in finding a copy of your article somehow.)