Here's a great site for you to start with:
http://www.qv500.com/indexmclaren.php
As for the owners/locations you'll have to take a closer look around our forum as you won't find much of that info anywhere else. I'd suggest starting with the Recap threads for the US, UK, Europe and Japan as those contain the most up to date info on the cars that are known.
>8^)
ER