John,
I'll echo Tommy's comments ... old school looks with modern foundation would have broader appeal. Many Cobra replica manufacturers take this same approach.
The tilt front end, gull wing doors all would add to the custom look of the car, as these were also mods that were done back in the day ... but xenon headlights, carbon fiber winglets and other 'modern' do-dads would look out of place on such a classic looking car, in my opinion
- Tim