Masthead design for an Auto Dealership

Design details: The design needs to portray the 3 core elements of a business:
Prestigious / High-end car sales
Ducati motorcycles
British classic sports car parts.

The attached mock-up gives a good overview of what I am trying to achieve.
I’d like to use at least 3 or 4, or maybe even 5 vehicles for each element. So for example; 4 cars to the left, 4 Ducati’s in the middle, and 4 British classic cars on the right.

The vehicles can be merged together if the style suits, but it must be clear that each is a separate category of it’s own and each only cover around ⅓ of the masthead width. Ideally the vehicles should be on the same ground plane, or at the very least scaled proportionally.

The cars on the left need to be high-end but also not perceived to be unobtainable. Porsche, Bentley, Audi are good examples.

The Ducati’s need to be current 2015 models.

The British cars need to include some of the following: MG MGB, MG Midget, Triumph Spitfire, Triumph TR6, and Triumph TR7.

Some images can be supplied.

Realistically I imagine the design will possibly take a few revisions to get right.

I’ve also attached some inspirational images.
Banner sizes: 1200x384
Ideas for the visual style: Photorealistic
Website information: Automotive
Extra notes: