Update: I've found an article about it on The LEGO Car Blog with some more information. The main designer is Ryan McNaught (a LEGO Certified Professional), and he chose the Britten V-1000 when his team was commissioned by an Aucklander to build a model for them. It took them "hundreds of hours to design and build" all by themselves, meaning there was no LSculpt or such in the process. Outstanding work. Toyco held a local contest to guess exactly how many bricks were used for it (which apparently still hasn't been revealed).
There's also a Flickr album with close ups, but Sun has all the detail covered.
There's also a Flickr album with close ups, but Sun has all the detail covered.