David,
The scene looks fantastic.
Just one question, when you mention Vray, Mentalray and Maxwell, did you mean the same final render / image is done 3 times but in different renders to show render techniques? Just to confirm.
Thanks 
Yes it will be the same final image in three different render engines.
It will be sold separately for people that are interested in only one of the three engines and it will be sold bundled together for people that want to see the difference between the three.
Hope that answers the question.
David
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"